Post to This Thread
antonio 17 Feb 2017, 10:35
AS you describe it, it's clear to me , you might be already mildly shortsighted.
I guess sooner vor later you will get a real minus prescription you really need for driving especially at night.
Do you want that?
Are you female, so you integrate your glasses into your Outfit as a nice accessoire when you wear them?
How do your friends react when you wear glasses as strong AS -4 and you remove them for driving ? :-)
Best regards and god luck, antonio-o
Hope to See you in lenschat.com
Soundmanpt 17 Feb 2017, 10:08
I know that you're disappointed that you didn't come away with an actual prescription for minus glasses but like you say it does appear that wearing glasses and contacts has at least resulted in a small change. And remember it's not like the doctor is taking your glasses and contacts away from you. So as long as you enjoy wearing your glasses and you apparently have good vision wearing them then just continue wearing your glasses just as you have been. When you first take off your glasses how long does it take before you're natural eyesight returns to you? I'm sure when you first take your glasses off things are very blurry so you know that when you're wearing your glasses your eyes are using the prescription of your glasses to see clearly. So the main difference is that your eyes don't remain constantly blurry without your glasses and that of course is what you would like to start happening.
Kiki057 16 Feb 2017, 16:56
Well that was the biggest let down ever!!! The eye doctor says my eyes are perfect but I think I'm going to get a 2nd opinion cuz when I just use one eye at time, especially at night it's pretty blurry. The last time I had my eyes tested 3 years ago I was given trial contacts for I believe +.75 and +.50 so maybe I really am going in the right direction?
antonio 15 Feb 2017, 14:54
Sorry at lenschat.com
antonio 15 Feb 2017, 14:53
Will you go there without wearing any glasses?
I guess you could get your first real prescription out of it for driving. Good luck. Best regards Antonio. If you like, discuss with us in eyescene.net
Kiki057 15 Feb 2017, 14:42
I go tomorrow after work. I am excited and nervous!
Soundmanpt 13 Feb 2017, 12:50
Have you gone for your eye exam yet?
Cactus Jack 13 Feb 2017, 08:26
One thing I forgot to mention in "How to Study" is the Red/Green test.
Near the end of the exam, you may (it is optional) be shown a chart where half the chart has a Red filter and the other half, a Green filter. This is a final check of your Sphere correction. Here is the rule: If the letters on the Red side are clearer than the letters on the Green side, you need MORE minus. If the letters on the Green side are clearer you need LESS minus.
The test is based on the principle of Optical Physics that Red light and Green light have different focus points because of their different wavelengths. The test has nothing to do with color perception and the test works even for people who are color blind.
If you do not have color perception problems and you are offered the test, you can usually get another -0.25 in your prescription by saying that the Red is clearer, but don't push it too far beyond, "equally clear". One step is generally OK, but two steps is the absolute maximum.
If you can schedule the exam late in the day, try to read a lot before the exam and in the waiting room.
Cactus Jack 13 Feb 2017, 07:44
Not everything, but perhaps enough to get an accurate exam. Have you decided if you will wear your sisters glasses or what visual complaints you will report? Myopia typically causes:
Inability to read see the board or screen at the front of the lecture hall or classroom.
Poor low light or night vision.
Blurry distant signs.
Difficulty reading menu boards.
Can't see distant things as well as your friends can.
Myopia typically does NOT cause:
Headaches when reading.
Close focusing problems.
Problems reading small text on phones or tablets.
Unless there is significant Astigmatism present.
kenpachi 13 Feb 2017, 01:40
Thank you so much.now i understand everything about the eye exam. I will go next saturday.and i will tell you the results.
Cactus Jack 12 Feb 2017, 17:24
Here it is.
HOW TO STUDY FOR AN EYE EXAM
An eye exam is not like an exam that you might take in school and there is really no way to study for it. However, you can prepare for it and learn about your role in the exam. The best eye exams are a team effort between you and the Examiner. Part of the preparation is to learn what to expect, particularly if this is your first eye exam.
One important thing you need to keep in mind is that the Examiner has no way to experience what you are seeing. He/she has to depend on your answers to questions.
There are two parts to an eye exam. The first part is the Objective part. This part consists of:
1. Taking a Visual History where you describe your vision and the kinds of problems you are having.
2. Checking the internal pressure in your eyes for symptoms of Glaucoma. This is one of the very few parts of an eye exam that is even mildly uncomfortable and the discomfort only lasts for a few seconds. There are two basic ways to do the pressure test.
A. Using a special instrument to lightly touch your Cornea. Not to worry here. Before doing this type of test a drop of mild anesthetic will make sure you don’t even feel it.
B. There is a new type instrument that uses a puff of air directed against your cornea. No anesthetic is required, but the puff will startle you. The puff of air is harmless and there are huge benefits. Detecting Glaucoma early, before it can do damage can save your eyesight.
3. The examiner will also get a preliminary estimate of your refractive error by using an Auto-Refractor or manually by using a small hand held instrument called an Ophthalmoscope or Retinoscope.
The Auto-Refractor is a relatively new instrument that was developed in conjunction with NASA to check Astronauts vision in space. You look into the machine with each eye individually where you will see a scene or a pattern. The machine will adjust its internal lenses to focus the image you see on your retina. The Auto-Refractor only takes a few seconds for each eye and it then prints out your estimated prescription.
Some Examiners prefer to use manual methods that have been used for many years. Using an Ophthalmoscope or Retinoscope and a Trial Lens set or a Phoropter (a fancy machine with a built in lens set), the Examiner will look into your eyes and select the lenses that allow him to see your retina, most clearly.
The object of this part of the exam is to get a starting place for the Subjective part of the exam where you have to describe what you see.
Typically the Subjective part of the exam starts with the Right Eye shutter open and the Left Eye shutter closed.
Step 1 is typically determining the cylinder and axis of any Astigmatism correction you need. This is actually the hardest part of the exam because you will be asked to judge relative blurriness of two images rather than the sharpness of an image.
You will be shown a line of text and a supplemental lens will be rotated into place. This lens is a cylinder lens that is mounted on a 45 degree pivot and can be flopped back an forth to bracket a trial axis or orientation of the long axis of the cylinder lens. The thing that is confusing about this test is that the straight lines (strokes) of the letters will alternate in clarity as the lens is flipped back and forth depending on their direction. I suggest concentrating on an “O” if possible. Depending on your answers, the examiner will adjust the axis knob unit the image you see is equally blurry with the supplemental lens 45 degrees each side of the selected axis.
At this point the Examiner will probably swing the supplemental lens out of the way and may change the cylinder power while asking you which lens in clearer.
For your first exam, you may be uncomfortable asking the Examiner to let you fine tune the Cylinder Axis, but I have found that most will appreciate your wanting to actively participate. The way that works is that he will place your hand on the Axis control knob. This time, you move it back and forth a few degrees looking for the sharpest image. It is a bit like “Fine Tuning” an old Analog TV set or moving the tuning knob on an analog AM radio for the best signal.
The next step is determining the Sphere correction. This is an easy part of the exam because all you have to do is pick the sharpest image, but there is a tricky part. Your auto-focus mechanism will try to help, if it gets a chance. The Examiner has a couple of ways to minimize the action of your ciliary muscles and crystalline lenses.
The Examiner can, in effect, sneak up on your Sphere prescription or he can use drops to Dilate your eyes. Lets talk about sneaking up on your prescription first. There are actually 4 lenses in your eye’s lens system. All of them are PLUS lenses and the total power is about +56 to +60 diopters. The only variable focus lens is the crystalline lens whose PLUS power is controlled by your ciliary muscles. For distance, your Crystalline lens is fully relaxed and has somewhere around +15 diopters. When you focus to read, your Ciliary Muscles squeeze the Crystalline lens to increase its PLUS power by the amount necessary to focus which depends on the distance to the object.
This will take a little thought to get your mind around, but if you are nearsighted, your lens system has too much PLUS for the distance from the lens system to your retina and you need MINUS lenses to neutralize some of that excess PLUS power. You ONLY have the ability to increase the PLUS power of your lens system. You have NO ability to reduce the PLUS power of your Crystalline lenses more that fully relaxed.
To try to keep your Ciliary Muscles and Crystalline lenses from getting in the act, the examiner will start with NOT ENOUGH MINUS or TOO MUCH PLUS (same thing) and gradually increase the MINUS one or two steps at a time, while reducing the size of the line you are asked to read. He will not tell you what power lens or what line you are looking at. Eventually, he will reach the 20/20 line and a lens power that lets you read it with no mistakes.
He will then follow the same procedure with your Left Eye.
When he has completed both eyes, he will open the shutters and you may see two images. This part of the test is to check your muscle balance using some prisms. He will probably ask you to tell him when the two images are aligned horizontally and then vertically. While the images are separated, you have an important check to make. Compare the sharpness of the two images. If they are not equally sharp, be sure and tell the Examiner which image is clearer. If there is a difference, he will likely reduce the sharpness of the clearest image until they match. The important thing at this point is that they match. That lack of sharpness will be corrected in the next phase with both eyes working together.
Next he will fuse the images so both eyes are working together and repeat the Sphere procedure by gradually increasing the MINUS or decreasing the PLUS until you see the smallest line of letters very clearly.
That pretty much completes the exam except for checking your near vision with a small chart about 14 to 16 inches from you.
Many people, who wear glasses, actually look forward to eye exams. Once you have become accustomed to having very good vision, you will probably find anything less, unacceptable. Many times, after the exam, it will be suggested that you get another exam some time in the future. Note that I used the word “suggested”. it is NOT a Command. If your detect a problem or if your vision seems uncomfortable, please don’t wait until the “suggested” date to seek an appointment to get your vision checked.
Let me know if you don't understand anything.
kenpachi 12 Feb 2017, 14:43
Where can i find your article "How to study for an eye exam "?
kenpachi 12 Feb 2017, 14:36
My vision fits perfectly with my sister's old glasses. I will get an eye exam soon and I will tell you the results. I will tell the examiner that i have trouble reading road signs and seeing the white board in school.And i will find the glasses -1.75 .-1.50 on the websites you provided me last night .
Cactus Jack 12 Feb 2017, 13:45
If you get an eye exam, I suggest you read "How to Study for an Eye Exam" which I wrote a few years ago.
Cactus Jack 12 Feb 2017, 13:42
Both tests show that you are a bit myopic. The second post with the +2.00 glasses revealed the following:
Right Eye (OD) 100/39 = +2.56
Left Eye (OS) 100/37 = +2.70
If you had no Myopia, the fuzziness would have occurred at 50 cm 100/50 = +2.00. Because the fuzziness occurred at 39 ad 37 cm, it means that your eyes were supplying additional PLUS, which is what happens in Myopia. If you had an eye exam, the prescription would probably have been pretty close to:
OD Sphere -0.50
OS Sphere -0.75
The problem with the test is that it cannot reveal if you have any Astigmatism.
There are some online tests for Astigmatism, but all they can tell you is that you have some or not, but they can't give you any idea of the actual values. Astigmatism is corrected by Cylinder and Axis numbers in the prescription. You have to have an eye exam to get those numbers.
One of the most important principles of Inducing Myopia is that you ONLY increase the Sphere and NEVER modify the Cylinder and Axis numbers from your actual prescription. Also, you ALWAYS increase both eyes by the same amount.
It would be best if you started with an eye exam, but we have enough information for you to get started.
I suggest you order some glasses with this prescription.
OD Sphere -1.50
OS Sphere -1.75
An increase of -1.00 in each eye.
When you get comfortable with those, you can order:
OD Sphere -2.50
OS Sphere -2.75
If you decide to get an eye exam, either do not wear any glasses or if not too obvious, you can wear your sisters old glasses. You need to explain to the examiner that you are having trouble seeing the board in class and have been wearing your sisters glasses because they help. If you get a prescription, don't get it filled, if you can avoid it, and let me know what it is.
kenpachi 12 Feb 2017, 07:50
I did another test which i think we should count on it because i used my calculus book. The test I did before i wasn't very accurate and the book's text wasn't small like the calculus book.the results is :
39 cm right eye . 37 cm left eye .
With +2.00 power lense . I did it 4 times and the results were the same.
kenpachi 12 Feb 2017, 02:09
Hello,I did the test with a 2.00+ power lenses.The text became fuzzy when the distance was 45 cm right eye . 43 cm left eye. The text wasn't too small nor too big . The P letter was 5 mm . And my mother language is arabic.
Cactus Jack 11 Feb 2017, 18:35
The second formula should be:
100cm/ focal distance = lens power in diopters
BTW, I am not an Eye Care Professional (ECP). My background is Electronic Engineering and Computers. I learned basic optics in Physics and learned about vision on my own, trying to understand my own vision problems.
Cactus Jack 11 Feb 2017, 18:31
Your English is fine.
It would be OK to do the test now and then do it again in the morning to see if there is any difference.
The formula for focal distance was codified by Sir Isaac Newton about 300 years ago. it is:
100 cm/lens power in diopters = focal distance
100cm ' focal distance = lens power in diopters.
The +1.50 or +1.75 reading glasses will make the focal distance about right for easy measurement. If the glasses are too strong, the text will get fuzzy much closer to your eyes and smaller distance errors will make a big difference in the accuracy of the results. It is OK to do the test with any reasonable power reading glasses, but please let me know the power or the prescription if possible.
Hopefully the reading glasses DO NOT have Cylinder correction. It will affect the results.
What language is spoken in Iraq?
kenpachi 11 Feb 2017, 16:29
By without perception i meant without going to the eye doctor .
kenpachi 11 Feb 2017, 16:27
I have a high degree at maths and physics also i am going
electrical engineering ,I live in Iraq,Baghdad,and the last time i did an eye test was 2 years ago and it was 0.00, yes i can order but it will take too long,can i buy them from drug stores without a perception?also there is a reading glasses in our house.Can i do the eye test now ? or tomorrow when i wake up in the morning ? because i did so much close work for today. I will ask my parents about what power the reading glasses is, and excuse me I am not good at English.
Cactus Jack 11 Feb 2017, 16:09
I see that Soundmanpt has also responded. We work together a lot, but have different styles. Our objectives are the same.
Cactus Jack 11 Feb 2017, 16:06
You have the right idea, but you need to be much more aggressive. You need to get higher and wear them all the time. The more close work you are doing the better.
The ideal place to start is with your actual prescription (refractive error). Even if you do not presently wear glasses or if your refractive error is 0.00, we need to know what it is, as a starting place. More about that later.
There are actually two types of Myopia. Axial or True Myopia, which is considered permanent, is caused by a mismatch between the total PLUS power of the eye's lens system and the length of the eyeball. The distance from the back of the Crystalline Lens to your Retina. The eyeballs of people with Axial Myopia, grew a bit longer than they should have by about 0.3 mm per diopter. Genes play the biggest role in Myopia and the visual environment plays a secondary role. Pseudo or False Myopia is considered temporary, but sometimes temporary can be a long time. It is caused by the Ciliary Muscles and Crystalline Lenses, your auto-focus system, having trouble fully relaxing after focusing close for a long time.
The idea behind Inducing Myopia is that you force your Ciliary Muscles and Crystalline Lenses to focus close as much and as long as possible by wearing glasses or contacts that have much more MINUS than you actually need. At 18, you have significant accommodation range, but your Ciliary Muscles may not be strong enough to be able use it all. When you were born, your clear protein of your Crystalline Lenses had the consistency of freshly made gelatin dessert. As you get older the protein gradually becomes stiffer and at some point you will need external focusing help, usually around 40, but not always. The condition is called Presbyopia (old eyes) and it can occur at any age. People who are farsighted are particularly vulnerable. That is why you sometimes see teens with bifocals to be able to read text on their smartphone.
Initially, you can pretty easily Induce some Pseudo Myopia and if you are lucky and are not too old and your genes will permit it, some of that Pseudo Myopia will turn into Axial Myopia.
I have a few questions and a simple test you can do to check for any Sphere refractive error. Unfortunately, there is no simple Astigmatism test you can do at home.
1. What is your occupation?
2. If you are still in school, what grade or level and the highest math or physics you have studied? That helps me determine how technical I can get in my explanations.
3. Where do you live? Country and city size over time you may need to see different Eye Care Professionals (ECPs) for progress checks.
4. Can you order and confidentially receive packages? With stronger and stronger glasses?
We will tell you what you need to order and how to do it once we have figured out where you are. Also, we will tell you what to say when you get an exam.
Here is the simple refractive test. You will need a pair of +1.50 or +1.75 Over the counter (OTC) reading glasses, a tape measure, and a book or newspaper. The reading glasses are to create artificial Myopia and move your focus distance into an easily measured range.
Pick a time when you are well rested and have not been doing any close work. You will do one eye at a time. In good, but not BRIGHT light, while wearing the OTC glasses, hold the book or paper where the small text is clear and easily readable.
1. Gradually move the book or paper away from your face until the edges of the text letters just becomes a bit fuzzy around the individual letters. Measure that distance an make a note of it.
2. Do Step 1, 3 times and average the distance.
3. Do steps 1 and 2 for the other eye.
4. Tell me the distance for each eye
5. Tell me the results and what power glasses you were using.
I will calculate your refractive error and suggest a plan.
Please do not buy anything other than the OTC glasses.
I suggest you also check out the Zenni Optical web site. They offer inexpensive, high quality glasses for a low as US$6.95. The frame and lens selection control the cost. Some glasses you will only wear for a month or so before changing to a stronger prescription. The trick when changing prescriptions is to use the same frame style. Few people notice prescription changes, but they do notice frame changes.
Also, download and read this article about the eyes and how they work. It will help your understanding. http://www.lhup.edu/~dsimanek/scenario/labman3/eye.htm
kenpachi 11 Feb 2017, 15:53
Thank you for helping me, i will order both of them and i will do as you said.
kenpachi 11 Feb 2017, 15:53
Thank you for helping me, i will order both of them and i will do as you said.
Soundmanpt 11 Feb 2017, 15:27
Your sister's old glasses are probably a little weaker than you want to be wearing. You're young and your eyes should be more than able to tolerate a little bit stronger glasses without any problem. I would suggest that you go on line to someplace such as "zennioptical.com" or "eyebuydirect.com" and order at least 2 pairs of glasses using the exact same frame number for both. Get one with -1.00 lenses and the other with -1.75 lenses. Once they arrive start off by wearing the -1.00 glasses completely full time, not just for certain things but everything. If you want to have any hope of ever needing -5.00 glasses you need to put on those -1.00 glasses as soon soon as you open your eyes each day and not tale them off again until you're going to bed that night. After your eye have completely gotten used to wearing the -1.00 glasses and everything is perfectly clear with them, then you need to start wearing the stronger ones. By using the same frame no one will notice that you're wearing the stronger glasses. Needless to say you don't really want to many questions being asked. What you're wanting to do will take a lot of commitment on your part. So you have to be sure this is what you want.
kenpachi 11 Feb 2017, 13:59
Hello everyone, I am 18 and i would like to be nearsighted, my parents are both myopic, but unfortunately for me that i am not, my sister is also myopic,I started using her old glasses ,It is maybe left -0.50 right -0.75, if i want to be -5.00 or more,should i wear those or get higher? most of my time is in front the computer,gaming ,should i wear them when i use my pc or reading? thank you
antonio 08 Feb 2017, 15:23
regarding you mentioned you See slightly blurried far Ehen driving Ehen looking far and closing one eye. That could Jean you Start to be really in need for at least a weak prescription for at least one oft your eyes for driving, perhaps even for both already. Your brain always shows to you the best image possible out oft what your eyes - biological cameras deliver to him as rawdata. It.s normal one Sees sligtly sharper with 2 eyes than with one as your braun eliminates bluriness vor sharpens your image by comparing computationally two slightly blurred images from your eyes. Vor simply one oft your eyes Sees better, then this image is shown to you whatever this eye can See. Hope that helps and looking forward to your eyetest. I.m shortsighted besides and my eyes behave somewhat similar to your :-).
Best regards, Antonio. See you in lenschat.com, if you like to discuss about vision,...
Soundmanpt 08 Feb 2017, 13:37
First of all as for as if the ECP would be able to tell that you had been wearing contacts I don't think he or she would be able to tell but even if you asked, which I really doubt, you simply say that you often wear some non-prescription colored contacts that you bought on line.
I saw what Bob commented and I do understand that like him you may want that feeling of being justified knowing that you actually do need glasses or contacts and I truly hope that you get a real prescription for glasses that will make you happy, but if that doesn't happen you at least still don't have to give up and stop wearing glasses. But at some point you;re going to have to slowly start wearing some of your weaker glasses maybe along with a pair of weaker contacts that equal out close to what your eyes are currently used to. Right now you're leading 2 lives when your friends and co-workers see you wearing glasses full time and your family thinks you don't need glasses. That can be dangerous if you're out with family and come across a friend or someone from work. The risk of getting caught is out there for sure. I look forward to hear the results of your eye exam.
Kiki057 08 Feb 2017, 08:23
Will the eye doctor be able to tell if I has wearing contacts up until my appointment?
Kiki057 08 Feb 2017, 07:58
To explain a little more, I have been able to wear my R: -4.25 and L: -4.75 freely at work and at home. All of my friends and coworkers assume that I actually need them. If I'm going to be around family I wear my contacts but can't wear my glasses. I am planning to schedule an eye exam soon and will let you guys know what I find out!
Bob 08 Feb 2017, 04:36
Even though the prescription may be below the -4.0 that Kiki057 currently wears, I can retrace the desire to get an acknowledgment that you are now myopic, even if your desire to wear glasses is a private affair, and even though you may just continue wearing your strong glasses anyway.
I had the desire to become glasses wearer myself since I was young, and eventually got a prescription similar to your original one (low plus). I wore this immediately full time, but was frequently disappointed by my ECP who only suggested (and assumed) part-time wear since the prescription was relatively weak. Only a few years later I experienced a steady increase in astigmatism (and moderate increase in hyperopia). I still recall the sensation when my ECP suggested that part-time wear would no longer be an option, and I got a condition on my renewed drivers license since I was no longer allowed to drive without correction (even though I hadn't done so in years anyway).
Anyway, this acknowledgment of my requirement for glasses felt rewarding, even though noone else knows about my true desire. But now wearing glasses is truly not an option anymore.
I am not sure if that reflects you sentiments, Kiki057, but that is why regular eye exams were (and still are) important to me. Anyway, if you like, it would be great to hear about your experience and result of your eye exam.
Soundmanpt 07 Feb 2017, 14:56
I remember you asking before and trying very hard to become myopic and without much success. I think the biggest thing you have working against you is the fact that your now 32 years old. Not old by most standards but for the eyes to be forced to change considerably too late. If you have been wearing on average -4.00 prescription in either glasses or contacts for several years whatever you get when you go for an eye exam is probably all you can expect. Going any stronger won't be of any help. If your eyes were going to be changed -4.00 is more than enough to make a difference. If your eyesight isn't being change or only changed slightly then it makes sense that even after wearing your -4.00 glasses all and taking them off that you are still able to see quite well without your glasses. But i'm not sure why if you cover one eye the vision in the other eye is more blurry and then the same if you revers it. As far as how to explain marks or dents on your nose caused by your glasses I would say if it is still daylight when you go then those marks could easily be caused by sunglasses.Also if you're female simply reapply makeup on your nose which every woman does quite often anyway. Of course when asked about glasses you say you lost them and you play dumb and have no idea what your glasses were for when you had them.
I know your goal is to be given a nice decent prescription for glasses but really what difference does it really make? Without any doubt even if you mange to get a prescription it won't be anywhere near -4.00. So if you were given a prescription for say -1.50 glasses what would that really mean for you. Your eyes apparently are doing and seeing very well wearing a much higher prescription so I doubt that you would run out and buy -1.50 glasses anyway. You apparently are completely happy with wearing either contacts or glasses that are at least -4.00 and you wear them all day long at your computer at work and you wear them for driving without any problem. So what's more important, having a piece of paper that says you need glasses or wearing glasses like you're already doing? Your the only one that knows that your still able to see quite well without glasses so everyone you know thinks you can't see very well. What they don't know is your little secret.
Kiki057 07 Feb 2017, 11:37
So I've posted here before and am hoping to get some answers. For the last few years I have been wearing glasses or contacts with an average of -4 in each eye. I work on a computer all day so I thought maybe that would help the process. 3 years ago I had my eyes tested and my RX was +.75 and +.50. I've been obsessed with glasses since I was a little kid. Now that I'm 32 and living alone I can wear them all the time without anyone questioning me. So I plan to make an eye appointment but I have some questions. I rocked Anatomy in high school but I don't remember everything about how the eyes work. So when I'm driving home and take my glasses off I can see pretty well but if I close one eye at a time it's blurry. Why is it that looking out of one eye at a time it's blurry but when they are working together it's barely noticeable. If I go to the eye doctor right after work I will have the dents on my nose from my glasses but if I wear my contacts right up until I walk into my appointment will the doctor be able to tell that I've had contacts in? I hope this all makes sense and I appreciate any feedback!
Cactus Jack 17 Jan 2017, 23:44
Yes, reading and close work with your glasses or contacts help the process. Normally, the Ciliary Muscles and Crystalline Lenses are fully relaxed with the minimum Plus power for distance. However, your Crystalline Lenses are NOT at Zero Power when fully relaxed. They are probably around +16 or so. If your distance vision is or is corrected to 0.00, your Ciliary Muscles squeeze your Crystalline Lenses to increase their PLUS power to focus closer than technically "infinity", but for practical purposes 20 feet of 6 meters. The amount of increase is determined by the laws of Optical Physics as codified by Sir Isaac Newton bit over 300 years ago.
In your situation, when you wear more MINUS than you actually need, your Ciliary Muscles squeeze your Crystalline Lenses and add enough PLUS to compensate for the excess MINUS in your contacts or glasses. Then when you read or focus closer than 20 feet or 6 meters, your Ciliary Muscles squeeze some more to enable you to focus close with your contacts or glasses.
If you have ever done any photography, you will understand the similarity between the pupils of your eyes and the Iris in a camera lens. Both control the amount of light striking the Retina, Film or Digital Sensor. In low light both are opened up, in bright light both are closed down to reduce the size of the aperture to control the light. There is a secondary optical effect of closing down or opening up the aperture. It changes the depth of field or range of useful focus. If you are in bright light and close down the aperture enough, everything from near to far will be in focus. If you open up the apertures to maximum in low light only those objects that are near the exact focus distance will be in focus.
When you do the refraction test, try not to do it in very bright light. It will give you truer readings.
You might find this paper informative about how your eyes work. I think you will be surprised.
Two important things to remember: 1. keep the pressure on was much as possible and 2. Nothing happens fast.
One other thing, I don't think you need to consider Gas Permeable Hard Contacts. I don't think you have enough Astigmatism to justify the hassle and expense.
May I invite you to contact me at email@example.com.
Zack 17 Jan 2017, 19:58
Yes that was without glasses or contacts. I am happy I am making any sort of progress even if minute.
I see what you are saying about the eye, I didn't really know that much about astigmatism before now but it makes sense to me now, it's pretty interesting.
I wear soft contact lenses and they are sphere only. They did not bump my prescription up because of my astigmatism as my contacts prescription is currently -2.5, which is the same as the sphere value of my left eye.
Tomorrow after wearing my -6 contacts to my classes, I will test myself again right after I take my contacts out.
Also will reading books and my computer while really close (with my glasses or contacts on of course) help with the process at all? That's what I have been doing and I feel like it is helping but I am not 100% sure.
Cactus Jack 17 Jan 2017, 19:19
Was that without contacts or glasses? It seems like you are making some progress. Your astigmatism confuses the issue a little because without correction, you are
OD -2.25 in the 25 degree Axis and -2.75 in the 115 degree Axis
OS -2.50 in the 180 degree Axis (Horizontal) and -3.00 in the 90 degree Axis
I know that sounds weird, but Axis direction is the Long Axis of - Cylinder. Think of the shape of your Cornea as a section from he side of an American Football. The Long Axis has a very shallow curve and the Short Axis is at a right angle (90 degrees) to the Long Axis is steeper and therefore has a bit more Plus power than than in the Long Axis.
You may have to read that and think about it for a bit and recall that corrective lenses neutralize or cancel out actual refractive errors.
Do you normally wear Toric Contact Lenses or Sphere only? For mild Astigmatism, 1/2 the Cylinder is often algebraically added to the Sphere and Sphere only Contacts are prescribed. That usually gives satisfactory vision and avoids the cost and hassle of getting Toric Contacts to stay correctly oriented on the Cornea.
I would like to ask you to do the test again after you have worn your -6 contacts for an extended period, Immediately after you take your contacts out.
Don't get discouraged if it is about the same or just a little closer. I will explain why after your report.
Zack 17 Jan 2017, 18:54
My last prescription from last August was
OD -2.25 Cyl -.5 Axis 025,
OS -2.5 Cyl -.5 Axis 180.
My vision was kind of fuzzy after my last examination because my ECP decided to not bump up my prescription anymore because the 20/20 line she showed me was blurry but just visible enough that I could read it. I should have spoken up in hindsight and said that it was not good.
In the past few years my cyl values have stayed the same and have not changed. Only the sphere values have changed.
I have completed the test,
For my right eye (OD), I got the numbers 33 cm, 33 cm, 33 cm, which averaged out to 33.
Then I took it and divided 100 cm / 33 cm and got 3.03.
For my left eye (OS), I got the numbers 30 cm, 31 cm, and 29 cm, which averaged out to 30 cm.
Then I took it and divided 100 cm / 30 cm and got 3.33.
I just woke up because I was tired so I was not awake for more than 10 or so minutes before taking this test.
Cactus Jack 17 Jan 2017, 15:53
I really need your last complete prescription before suggesting a strategy. I am particularly interested in any Cylinder and Axis numbers for correcting Astigmatism.
There is a very simple test you can do to get an approximate indication of your refractive error. You will need a book or newspaper (target) with normal sized print, a tape measure, and you may need some OTC reading glasses to get the distances involved into a useful range. This test can be done at any time of day, but it may be more indicative of your true prescription if done first thing in the morning BEFORE you put on glasses or insert contacts.
1. Hold the target at a distance where you can see the text clearly. Close one eye.
2. Gradually move the target away from you face until the text just becomes fuzzy.
3. Measure the distance.
4. Do steps 1 thru 3, three times and average the distance for each eye individually.
5. Divide the average distance into 1 meter (100 cm or 39.37 inches).
Note: If the distance is inconveniently far for the length of your arms, you can create some artificial Myopia by using OTC Plus Reading glasses. You want to use the minimum Plus to get the blur point distance to about 50 to 66 cm or 20 to 26 inches. You will need to adjust the calculated prescription for the supplemental Plus.
If you don't understand how the test works or need help, let me know and also let me know the numbers you get.
The result is inverse of your approximate prescription. Here is an example of how it works. Lets say that you do the above test and the text gets fuzzy at 20 inches (50 cm). Sir Isaac Newton's formula for calculating lens power vs focal distance is 1 meter / Focal Distance = Lens Power in Diopters. 39.39/ 20 inches = 1.96 or +2.00. That is your refractive error. The corrective lenses would be -2.00.
If you need to move the blur point outward you can do the test with low power minus glasses. You might try the test with low power contacts or glasses.
I need some of the above test results before I can help you develop an exam strategy. In your situation, it is easy when you understand the principles.
Zack 17 Jan 2017, 06:23
You suggested that I create a strategy for my next eye exam,
How long should I wait or when should I decide on going in for another eye exam? My last one was in August.
Also are there any tips or tricks I should know before going into an exam?
I would also like to ask if there are any tests I could be doing to check my progress and how often should I do these tests? I am interested in keeping track of my progression.
Thank you very much for your help,
Zack 16 Jan 2017, 15:29
Thank you for the information, I will look into those sites when I get home and see if they will ship to the US.
Iain 16 Jan 2017, 15:09
Try lensway or lenscatalogue here in UK, not sure they post to US
Zack 16 Jan 2017, 14:50
Iain and Cactus Jack,
Thank you both for the encouraging words and for sharing your stories! It gives me hope that I can possibly induce or even wear high prescriptions full time.
I would preferably get up to -12 or maybe even more, but I set my main goal at -6 or -8 as I do not know how much I will truly be able to truly induce as it can be unpredictable and like Cactus said it is up to my genes.
Even if I do not induce to that high of a prescription, it would still be cool to wear any of those prescriptions full time.
I would like to try and buy some gas permeable contacts as my next pair because I have been reading up on them and they sound nice. Iain, do you have any brand you could recommend and also a website where I could get them from? I don't think the website I usually buy contacts from sells gas permeable contacts, and I am having trouble finding a website that sells gas permeable contacts without a prescription.
Thank you both so much!
Iain 16 Jan 2017, 14:12
That's very encouraging about the guy you helped. Come Easter I will have increased my cls Rx by -12. Was he able to maintain his new vision? Do you think I will be able to continue beyond -12 cls? I would like to go as far as I can.
My future beyond uni is unclear. More study is a possibility but I want to travel as well. I will be 21 in August so wish to explore. Travelling will complicate my induced myopia regime. Is it better to continue with youth on my side?
Zack you are doing great. Cactus is very encouraging. How high do you wish to go? Gas permeable have suited me, I get a new Rx every four months. I think my eyes have adapted so well as they do not get a chance to be without correction.
Zack 16 Jan 2017, 11:47
That's amazing! I could only hope to get to that point eventually, but I will have to work up to it overtime. I have -13 glasses and I have worn them a bit around the house and I could see well with them in bright light but not perfectly in dim light, also my eyes would defocus for a few seconds every half hour or so when I was wearing them.
And I forgot about that, I guess I have never thought of sleeping that way, I will still try to be as careful as possible and wear my contacts or glasses from waking up to going to sleep at night. I just want to have as much stress on my eyes as possible.
Is there anything else I should be doing to make sure my ciliary muscles become as strong as possible, like reading for a long period of time and getting real close to the page?
Cactus Jack 16 Jan 2017, 11:03
Zack and Iain,
A few minutes without your glasses or contacts won't make any difference in your efforts. Your Ciliary Muscles get to relax for several hours while you sleep. The key to Inducing Myopia is the strength of your Ciliary Muscles. For their size, they are normally the strongest muscles in the body. Your efforts just make them stronger. The young man I mentioned had to get occasional dilated exams to gauge his progress. His goal was to flunk the "official" mandatory military service eye exam where they used a very strong dilating agent. Probably Atropine. Most ECPs use dilating agents for "wet" exams that wear off in a few hours.
Cactus Jack 16 Jan 2017, 10:52
Zack and Iain,
Several years ago, I worked with a VERY highly motivated young man in his late 20s who needed to be substantially more myopic than he was (about -4). He ultimately was able to wear -20 glasses while studying to pass the TOEFL exam.
If you do the Vertex Distance math, -20 glasses are effectively -16 at the Cornea so he was able to focus to read with 12 diopters of over correction. Because of his age, it was mostly Pseudo Myopia with only a bit over -1 of additional Axial Myopia, but the important thing is that it worked for his purposes.
Because you started at a younger age, it is possible that you will develop more Axial Myopia, but your genes are in the "driver's seat". It does not really matter which type of Myopia you develop as long as you understand the difference and that Pseudo Myopia needs maintenance. Maintenance is more important when you are young because your Crystalline Lenses are still very flexible and your Ciliary Muscles will relax fairly quickly. However, the most important thing that happens is that your Ciliary Muscles get very strong and are able to deal with the additional minus in your glasses very quickly.
Zack 16 Jan 2017, 10:41
I have been very careful to not see without glasses or contacts too. Most of the time I take my contacts out in before a shower and immediately close my eyes. I don't open them until I am out and my contacts are back in.
Right now I use extended wear contacts (Pure Vision), do you think I should switch to gas permeable ones? I only have one more -6 contact and I just put in a new monthly pair today, so I need to buy more -6 contacts. If so, any suggestions on brands or where to get them?
Thank you both Cactus Jack and Iain.
Zack 16 Jan 2017, 10:16
Sounds like a plan, I will stay with my -6 contacts until the blur is completely gone in the dark, and then I will begin to move up in increments like Iain. Other than the small blur in the dark (things like the time on my phone are a bit fuzzy when the screen is dim) my vision is really good with these contacts and glasses. After the blur is gone, I will move to -7 contacts and -7.75 glasses.
1. I live in New York and I live off campus in my own apartment away from my family.
2. My favorite subjects are history and science, however I am in school for Computers as the subject also interests me.
3. My last eye exam was in August.
I work and therefore I have the money to go in for eye exams whenever I want as I have a pretty good amount of expendable income.
My ECP is back at home which I am only at during the summer and holidays, and therefore I have not gone to an eye doctor here at school and I have many doctors to choose from.
That's very cool, I would like to be able to build up wearing stronger glasses to my family so they notice my vision getting worse so it's no shocker as the glasses get stronger. I will probably try to move in increments like you, every few months I will increase as long as I have accommodated appropriately by then. I am only in my second year of college and I am double majoring so I have 2 maybe 3 more years ahead of me.