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George1968 24 Mar 2017, 17:16


You have to make the choice as to how often you wear your glasses. It's a combination of physical and psychological comfort.

Some people are really bothered by the vision they have when their prescriptions are -2.50 and higher, and so wear their glasses for because it is physically more comfortable for them. Others can deal with the less than perfect vision, or are so distressed about wearing glasses, that it is not worth it for them to do so.

That's all up to you. If you feel the glasses are too thick, you can either change the glasses or not wear them unless you absolutely have to.

Or, maybe after a couple of days, you'll figure that, on balance, it is better to wear them than not.

George1968 24 Mar 2017, 17:11


How often are you wearing your glasses? Do they make a difference?

You might notice some change in thickness, but I think it is more of a thing that you are -- or you are considering -- wearing your glasses full time and are worried about what people will think.

Soundmanpt 24 Mar 2017, 09:10


I can't understand why your lenses would be as thick as you say they are. Even the optical stores don't start suggesting high index lenses until a prescription gets a bit stronger than -2.50. Now of course if you wear rimless or semi-rimess glasses there is no frame to cover any thickness. Of course your lenses would be slightly thicker going from -1.50 to -2.50 and -1.25 to -2.25. Enough that you would be able to see the difference but not to the point where they should look too thick or strong. Most places that you buy glasses form have a return policy for up to 90 days which allows you to change your glasses or modify them without any charge. So you have several options. One is go back and pay the extra to have high index lenses put in. The other is to get a full plastic frame which should cover or hide any thickness from being seen. In either case you would only be charged the difference. Switching to thinner lenses should be under $50.00 and switching frames might be a refund to you depending on the prices of the frames.

Dahlia 24 Mar 2017, 03:23

They are really quite thick.

bracesfan 23 Mar 2017, 23:50


Cokebottles at -2,5 diopters? Sorry but you are exaggerating. Even in 1,49 and with big frames itīs only a couple of milimeters. You should see what cokebottles are and how they change the face.

Likelenses 22 Mar 2017, 23:51


There is nothing hotter that a twenty year old girl with thick lenses.

Rebecca 22 Mar 2017, 00:20

I don't know what my current real prescription is. I really hope it has increased this time. I'll have another eye exam in April. Currently I wear -3.75 glasses and I've gotten used to them, so I will get a stronger prescription next time I buy from Clearly.

NNVisitor 22 Mar 2017, 00:06


You do not have a very strong prescription however very large frames will result in thicker glasses. My Glasses were much much stronger and yes my glasses were very thick until I started purchasing high index thinner eyeglass lenses in smaller frames. We are our own worst critics when it comes to how we think our glasses look to others. I've found out after many years that to other people the appearance of my glasses were no big deal. Everyone has their own problems that they focus on so don't worry about your appearance with your glasses on. To others they will look absolutely great on you.

Dahlia 21 Mar 2017, 21:09

Glasses arrived earlier today. They're absolute cokebottles unfortunately. I asked the guy why the lenses were so thick. He said it's because I chose an "oversized" frame with 1.49 index lenses. Not sure what that means but I am not happy!

Likelenses 21 Mar 2017, 19:57


Yes, you should be a full time wearer.If not now with in the next two years you will probably be peering through -4.00,and unable to function without correction.

Bottomline is SOONER, OR LATER.

George1968 21 Mar 2017, 12:39


Do you have an issue wearing glasses fulltime?

Look, no one will make you wear your glasses. It's a matter of physical and psychological comfort.

So, when you get them, wear them for a couple of hours and then take them off. Do you feel you are comfortable with the vision without glasses?

If not, you probably have your answer.

Soundmanpt 21 Mar 2017, 09:21


I am curious as to tow much you wore your previous glasses that were -1.50 / -1.25? In my opinion you were just under what I would consider the borderline of needing your glasses full time. There is no glasses police so when and how much you choose to wear your new glasses is strictly up to you with of the exception of driving where you certainly need your glasses for. Since you're in your early 20s your eyes are still in that time frame where it is very common for your eyes to have some change every year. But it shouldn't be too long before your eyes become stable. So in the 2 years since you last had your eyes checked they have changed by a diopter in each eye. So it is safe to say had you gotten your eyes checked after one year the change would have only been about -.50 making your glasses -2.00/ -1.75 a year ago. So hat amount of change is about what would be expected by now. It si safe to say that after wearing your new glasses for a few weeks and then testing your eyes with your previous -1.50 / -1.25 glasses you will quickly know that they are too weak to even use as a backup or spare pair. So I agree with Cactus Jack that you probably do need to be wearing your new glasses full time now.

Dahlia 21 Mar 2017, 08:45

I'm in my early 20s. It's been a while since my last test. Maybe 2 years.

Cactus Jack 20 Mar 2017, 22:46


You probably should. Without correction, your visual world is a sphere approximately 40 cm in radius. Beyond that distance, everything is increasingly blurry.

You have moderate Myopia and effectively you are wearing +2.50 reading glasses all the time. It is great for close work or reading, but you probably can't recognize someone you know 6 meters away. Also, your Ciliary Muscles are probably very weak because they don't get much exercise. That will probably cause you some problems when you first start wearing the new prescription. However, that will only last a week or two.

You did not answer the two other questions I asked. Your answers will help me offer better suggestions that more closely meet your needs.


Dahlia 20 Mar 2017, 20:48

Yes, that is it. Do I need to wear glasses all the time?

cactus Jack 20 Mar 2017, 20:16


Were those your complete prescriptions?

Not really a huge increase, but it depends to some extent on your age and the time interval between the Old and New prescriptions.


Dahlia 20 Mar 2017, 19:25

New prescription:



Old prescription:



Is it a lot worse?

Cactus Jack 19 Mar 2017, 17:30


Here is an expanded version of your daughter's prescription:

OD (Right Eye) Sphere +0.25 Cylinder -2.00, Axis 096 degrees

OS (Left Eye) Sphere +0.50, Cylinder -1.75, Axis 068 degrees

The PLUS Sphere number means that she is a tiny bit far or long sighted (Hyperopia). By itself, it would be almost insignificant. Almost all children are born with Hyperopia because their eyeballs are small to fit in their small heads. Fortunately, children also usually have abundant Accommodation Amplitude and can easily compensate for their Hyperopia. As a child grows and their eyeballs grow, they will become less and less Hyperopic. Eyeball growth is primarily controlled by their genes, but the visual environment can also be a factor in how vision develops. It is likely that your daughter's sphere correction will decrease and perhaps, she may become a bit nearsighted (Myopic) by the time she is in her early 20s.

The thing that is significant and the dominant factor in your daughter's prescription is the Cylinder correction for Astigmatism. Astigmatism affects vision at all distances and it makes text very hard to read, comfortably. The problem is that it requires external correction.

Astigmatism is typically caused by uneven curvature of the front surface of the Cornea. It is steeper in one direction than it is in the other. We think of a cylinder and being something shaped like a "can" in the pantry. Ideally, the Cornea is shaped like a slice from the side of a glass ball. If a person has Astigmatism, the Cornea is shaped like a slice from the side of a glass American Football. Often people with Astigmatism will see a "ghost" image of the words when the read.

The Axis is the Long Axis of the Cylinder. Cylinder and Axis are ALWAYS listed together. The actual Axis angle does not have any particular effect on a persons vision, but when a Cylinder correction is specified, the Axis needs to be very close to the actual Axis of the person's Astigmatism.

Just as an FYI, by convention, 0 (or 180) degrees is horizontal and the numbers increase in a counter-clockwise direction, looking at the patient. 90 degrees is vertical and on around to 180 degrees. Axis is always specified as between 0 and 180 degrees. Some Eye Care Professionals (ECPs) like to use 0 to 179 or 1 to 180.

We don't know the actual cause of Astigmatism, but it seems to be related to uneven growth of the eyeball putting stress on the eyeball. Incidentally, even with your daughter's astigmatism, the difference in curvature is very tiny. At some point in the future, when she has stopped growing, it may be possible to correct her Astigmatism with minor Refractive Surgery, if it is a problem.

When she gets her glasses, things may look a little distorted initially, but that will go away in a few days. Vision actually occurs in the brain, the eyes are merely biological cameras. Her brain is used to dealing with distorted images and it has to get used to working with corrected images. I suspect she will find it much easier and more comfortable to read.

I hope this helps. Feel free to ask more questions is you wish.


Question 19 Mar 2017, 09:16

My 11yr old daughter was just prescribed glasses for the first time after a school eye test detected a problem and alerted my wife and I. Her prescription is OD +0.25 -2.00 096 OS +0.50 -1.75 068. Can someone explain these numbers and let us know what to expect in the coming years? My wife only wears readers and I'm close to that point, but neither of us ever wore glasses otherwise, thanks.

Soundmanpt 19 Mar 2017, 09:06


I have been following your correspondence with "Cactus Jack" and the advice he provides you can take to the bank. He mentioned that if you do decide to get glasses that you might want to order them on line. If so you will find that there are a number of places that offer glasses on line. But the one I and many others in this site prefer is "" but "eyebuydirect,com" is also quite good. They both offer several hundred choices for under $13.00 and that is for a complete pair of glasses in your prescription. For an additional $5.00 you can get an optional AR coating (anti-reflective) which I highly recommend. It is of course up to you if you get glasses or don't get them but because of your job as a nurse you know how important having good eyesight is when reading medicine bottles and so much other small print. Going without glasses your eyesight is at least slightly impaired for both distance as well as up close. You are very slightly nearsighted but wearing glasses when driving would make seeing signs somewhat clearer and driving at night your glasses would be even more useful to you. It would be up to you how much you choose to wear your glasses but I think that you would find wearing your glasses enough of a benefit while at work as well as for driving. They would be helpful at the movies, concerts and viewing sporting events. I will warn you that if you get glasses when you first put them on because of your astigmatism things may seem a bit off like the floor may appear to be at an angle and you may feel slightly dizzy or even get a small headache but that will rather quickly go away as your eyes adjust to your glasses.

cactus Jack 18 Mar 2017, 15:44


Astigmatism affects Visual Acuity at all distances, there is really nothing you can do about it except wear external corrective lenses. It is particularly noticeable when reading very small text.

Vision actually occurs in the brain. The eyes are merely biological cameras. The brain has amazing image processing powers and can correct images if it knows what something is supposed to look like. The brain can also create images with your eyes closed such as when you dream or have hallucinations.

If you decide to get some glasses, you should wear them full time for about 2 weeks and then make a decision about when to wear them. Initially, you may think that glasses have made your vision worse, but that is not correct. It usually takes about two weeks (maybe less for your low prescription( for your brain to get used to the images being corrected optically and stop expending the image processing effort.

If you get an opportunity, it might be helpful to read "How to Study for an Eye Exam"


Beth 18 Mar 2017, 14:20

Thank you for the explanation re the cylinder that makes sense . I am 31 years old, UK based and work as a psychiatric nurse. I am confused I thought with short sightedness it's difficulty for distance not up close like reading tasks. Sorry for my ignorance in this area!

Cactus Jack 18 Mar 2017, 14:14


Prescriptions written in +cylinder format are harder to understand than the more common - cylinder format. Typically, MDs use +cylinder and ODs, Opticians, and Lens Makers use -cylinder format. There is an easy formula for converting from one format to the other. The prescription you were given:

OS (Left Eye) sphere -1.00 cylinder +0.75 axis 90

OD (Right) sphere-0.50 only

is converted by algebraically adding the cylinder to the sphere, changing the sign and either adding or subtracting 90 degrees to the axis to be between 0 degrees or 179 degrees. The conversion results in this prescription.

OS (Left Eye) sphere -0.25 cylinder -0.75 axis 0 (long axis horizontal)

OD (Right) sphere-0.50 only

You are very mildly short sighted. Because of the astigmatism in your left eye, I believe you will find that wearing glasses would help your eyes work together better and make it easier to read small text with less fatigue.

If you have not ordered glasses, you might consider ordering some inexpensive glasses, online.

May I ask:

Your age?

Your occupation?

Where you live?


Beth 18 Mar 2017, 13:38

Hello I got given this prescription and wanted your thoughts on whether it's worth getting it made into glasses,I remember it making a difference on the eyechart but will it be enough of a difference in the real world. Also what does it mean to have a minus sphere but a plus cylinder? Am I long and short sighted in that eye?

Left sphere -1.00 cylinder +0.75 axis 90

Right sphere-0.50 only

Beth 18 Mar 2017, 13:37

Hello I got given this prescription and wanted your thoughts on whether it's worth getting it made into glasses,I remember it making a difference on the eyechart but will it be enough of a difference in the real world. Also what does it mean to have a minus sphere but a plus cylinder? Am I long and short sighted in that eye?

Left sphere -1.00 cylinder +0.75 axis 90

Right sphere-0.50 only

Frank 28 Feb 2017, 03:29

Sorry, I meant to write Roy in my previous post.

Frank 28 Feb 2017, 03:28


Thank for the detailed overview. Luckily I am not dealing with any vertical deviation, but my progression of horizontal deviation follows a similar pattern as yours. I understand that you mostly corrected for comfort, not full correction, so I guess I need to be mindful of that when ordering my next correction. But as far as I can understand you still seem to be able to fuse the images if you want, which is good.

Thank you again!

HighMyopic 25 Feb 2017, 11:14

Roy whats your email? I would love to see pics of your 24 prism glasses. I collect very strong glasses. My email is

Roy 25 Feb 2017, 10:54


I first experienced double-vision around the age of 15 when I noticed a vertical split image when looking to the left or right extremes of my visual field. I was prescribed a 2 up/3 down prism. This fixed the problem and has remained part of my prescription ever since.

My need for the horizontal prism came much later - in my mid/late forties I think. I noticed eye strain which the optician was able to relieve with base-out prisms. I believe my first prescription was around 4 BO (shared). It crept up over a few years to around 8 shared and was fairly stable at this until around my mid fifties. (I am 70 now.) Over the last 14 years or so it increased steadily to the current value of 24 shared. The pattern is usually the same when I need an increase. I notice the eyes strain more as they maintain fusion. A small increase, usually 2 dioptres relieves the strain and relaxes my eyes.

Frank 24 Feb 2017, 00:51


your prescription sounds indeed very high. Can you recall at which prescription your double vision became more permanent?

When doing CJ's test (see my results in the post before yours) I noticed a considerable jump and stronger variation of my correction needs. How was your experience over time?



Cactus Jack 22 Feb 2017, 07:26


That seems reasonable. Many ECPs prescribe less than full prism correction for good reason. If at all possible, they want to leave some convergence ability for close work.

Even with prism correction, it is fairly common to see double when looking extremely left or extremely right. What happens is that as your eyes look that far left or right, one eye will "hit the stop" before the other and it will be physically impossible for the eyes to track together.

From an engineering point of view, the Eye Position Control System (EPCS) (my name) seems to be what is called an Open Loop Servo system that only needs some prism help to get the two images into "fusion range". Based on my experience, the EPCS seems to use sharp vertical lines or edges in the images to "lock on to". The thing that seems to cause confusion for my EPCS is images with repeating patterns or elements such as wallpaper or a row of light bulbs in the fixture over my bathroom mirror. If I am not paying attention, I will break fusion and I have to look at something else to re-fuse the images.

The exception to prescribing less than full correction is those situations where the EPCS has limited control over eye position, such as traumatic brain injury. In those instances, it may be necessary to prescribe full prism correction for distance and a different amount of prism for focusing close. Lenses with different amounts of prism for distance and close are called "Slab-Off" lenses.


Roy 22 Feb 2017, 06:38


I tried your prism test, repeating it several times to get an average, and arrived at a figure of 35 dioptres (base-out correction needed). Does that see reasonable, compared to my prescription of 24 BO (shared), which implies that my eyes can manage the other 11 dioptres?

I don't get any double-vision with the new glasses. With my previous pair, which have a prescription of 22 base-out, I was getting slight double-vision, but only when looking at the extreme right hand side of my field of view.

To me it looks as if I need the full 24 BO. As I said before I am concerned that any further increases may take me beyond the limit for manufacturing the the ground-in prisms. Do you know what the limit is?

Thanks for your help

Frank 22 Feb 2017, 04:34


Thank you for pointing me to your test. I had taken it before, and developed an adapted version of it for ad hoc use on my computer at a distance of 1m. I have measures the deviation for the past few days (with wide range of variations, strongly dependent on my fatigue), with rather high values in the morning and evening. I measured average values of 15 diopters. That hit me with surprise. I had estimated a total deviation of 15 BO from past tests, but this is on top of my current 6 BO (my astigmatism prevents me from reading the measure without correction at any distance).

Since starting to wear prisms, I have 'learned' to control my eyes in that I can relax them spontaneously, something I hadn't been able to do before. I am wondering if that is normal once getting used to prisms. However, I also noticed that my eye positioning system is very adaptive, and after a few minutes, my eyes drift further apart. So I suspect the current measures are only the status quo, but are likely to increase if I would wear a permanent correction of this strength (21 dptr BO). After relaxing my view for some time, it becomes quite hard to bring my eyes back into fusion. Is that something to be worried about?

Given the aesthetics of such high correction and the ease with which my eyes adapt to it, I would prefer to hold off, and only correct it to a level that allows me to read properly without tunnel or double vision as long as possible, but I am wondering if my planned 10 BO is sufficient for this, or just wasted money...

Thank you for your advice!

Cactus Jack 18 Feb 2017, 17:43


See my reply to Roy, below. You can also do the test.


Cactus Jack 18 Feb 2017, 17:41



It is not hard to measure the amount of prism it would take for full correction. All it takes is some adding machine or cash register tape, a marking pen, some painters or masking tape (ideally with very weak "stick-um" for easy removal) and something to measure distances.

It is a little easier to work with metric measurements, but you can do it also with inches and feet. You just have to do a little more math for conversions between the two. Just remember, 39.37 inches = 1meter or 100 cm.

This test is based on the definition of 1 prism diopter as: "That amount of prism that will deflect a ray of light 1 cm at a distance of 1 meter (100 cm)".

Ideally, this test is done without any prism correction in your glasses, but you need to be able to see some calibration marks on the adding machine tape with reasonable clarity. If you can't see the marks without glasses, you can still do the test, but you must account for the prism in the glasses.

1. Select a fairly blank wall where you can attach a calibrated adding machine tape, using painters or masking tape.

2. Decide where you will stand or sit while doing the test. Between 3 and 4 meters or 10 and 14 feet works best. Measure the distance from that location to the wall selected in Step 1.

3. Calculate how much displacement 1 prism diopter represents at the distance measured in Step 2. The calculation is not hard. Recall, the definition of a prism diopter above. If the distance from where you will stand to the wall is 3 meters, 1 prism diopter will displace the images 3 cm

4. Using the marker, mark the adding machine tape with major divisions 5x the distance calculated in Step 3 and optional minor tick marks at 1 prism diopter intervals. The marks need to be big enough to see easily from the distance in Step 2. You might want to identify the major divisions as 0, 5, 10 etc. Note: Some large bold markers will bleed through the adding machine tape and permanently mark the surface you are using as temporary backing for the adding machine tape. Test and take appropriate precautions to prevent damage by the marker ink.

5. Attach the adding machine tape, stretched out horizontally, to the wall selected in Step 1.

6. On another short piece of adding machine tape mark an arrow lengthwise and attach that piece of tape to the wall, vertically, so the arrow is pointing at 0. You are ready to do the test.

7. Place yourself at the location selected in Step 2, let your eyes relax so you see double and note where the "0" arrow appears to point in the displaced image. Try this test several times during the day and at varying degrees of fatigue. Make a note of your results.

8. If you are wearing glasses with prism, adjust the readings in Step 7 for the total prism in the glasses. For example, if you need to wear glasses to see the marks and the glasses have say at total of 12 diopters Base Out (6 in each eye), what ever displacement you measure needs to be added to or subtracted from the 12 total BO. It is sometimes hard to decide if you need more prism in your glasses or less, but you can probably figure it out.

This test will work with horizontal prism (Base Out or Base In) or vertical prism (Base Up or Base Down) by the placement of the long tape and short tape. Often both horizontal and vertical prism exist at the same time. You just have to change the orientation of the tapes from horizontal to vertical.

Note: It is sometimes difficult, if small amounts of prism are involved, to tell if the prism correction needs to be Base Out or In, Up or Down. You may be able to tell by noticing which way the images are displaced when you block the eyes alternately. For example, if you cover the right eye and the image from the left eye is on the left, you probably need more Base Out.

Please Let me know if you have any questions and if this works for you.


Roy 18 Feb 2017, 07:20

Yes Cactus I would like to try your prism test. How would I need to modify it for my prescription?

Cactus Jack 17 Feb 2017, 16:06


Have you done the Simple Prism Test? If you want to do it, we may need to modify the test slightly because of your prescription. Let me know if you are interested.


Roy 17 Feb 2017, 14:46

My 2-year eye test resulted in a reduction of 0.25 in each eye for my myopia and an extra 1 diopter to the base-out prism in each eye. Prescription now reads:-

Right eye -1.50, -1.00 @ 88, prism 3 down & 12 out

Left eye -4.25, -1.00 @ 80, prism 2 up & 12 out

Add 3.00

Got my new (progressive) glasses with this prescription yesterday and am really pleased with them. The slight double vision I had when looking to the left has gone and vision is noticeably sharper. (I just managed 20/20 in the eye test.)

The outer edge thickness of the lenses is now around 12mm and I re-used an old titanium frame with a 2mm thick rim. The edges of the lenses are not polished or chamfered. (I requested this.) I love the look of them. Just a bit worried I might reach the limit of prism that can be ground in if I have any more increases in the horizontal prism. Does anyone know what the limit is for this?

Cactus Jack 16 Feb 2017, 10:05


Have you done my Simple Prism Test? You can measure your needs with surprising accuracy.


Frank 16 Feb 2017, 03:13

Hi CJ (et al.),

Thank you for your advice/experience. To figure out which prescription I should order, I have gotten some prism foils from an optical shop (2 BO to add onto my current glasses, and 8BO to use with an older pair that doesn't have prism correction).

I have been wearing those for a few days (at home only, though - vanity is an issue ;)) and got somewhat used to the reduced vision quality of the foils. In fact, they seem to act more like occlusion foils, but the vision comfort outweighs this disadvantage (I notice that once I take them off)

But after those few days, I realise that my eyes tend to drift off again, and I have severe problems keeping my eyes fused in the morning wearing my regular prescription for work (especially when tired). For the purpose of testing, I now tried the 8BO foil on top of my regular glasses (adding up to 14 BO in total), and must admit that the vision was never so relaxed. But I also realise that it is extremely hard to fuse my eyes again for the rest of that day once I remove the foil.

I suspect that my deviation is definitely higher than the prescribed 8BO, and I am now wondering how high my strabismus really is (since my eyes adapt so quickly). I will at least order 10 BO for my daily use, but wonder if it makes sense to go higher immediately?

Any thoughts appreciated!


Soundmanpt 08 Feb 2017, 14:08


Most likely you only barely passed the drivers vision test when your prescription was -.50/-.75. Now that it has changed slightly to -.75/-1.00 i'm quite sure you would be unable to see 20/40 which is the limit you need to able to see. You likely only passed on the basis of your -.50 eye before and if both eyes had been -.75 you would have failed then.

You made a wise decision when you went from only wearing your glasses for night driving to wearing them during the day as well. It's really not a bad idea even for the ones that only wear -.50 glasses to wear their glasses anytime they are driving.

Many years ago I was dating a girl that was 17 and she was about to go for her driver's permit.She was smart enough to first go and get her eyes examined a few months before because she was having trouble seeing the board at school. She was prescribed glasses and her prescription was -.50. I had promised her that when she got her permit I would teach her to drive. I was going to be teaching her in my car. I had a 73 Dodge Charger that I ordered special with everything on it so it was my baby. It got washed at least 3 or 4 times a week and waxed at least once a month. Anyway the very first day of her first lesson I told her she needed to wear her glasses. She wasn't very happy with me and she didn't even have her glasses with her. So I drove her home so she could get her glasses. I told her what she did after she got her license and own car was up to her but whenever she would be driving my car she would have to wear her glasses. She wanted to drive bad enough that she didn't put up any argument and when ever I came to get her for a driving lesson from then on she was waiting with her glasses on. She was actually a good learner, or maybe I was a "great" teacher, but she was ready to take the driver's test after only a couple months. I let her drive quite bit once I saw that she was doing really good. After a while she got her own car and I was glad to see that she continued wearing her glasses. Sadly her dad got a job in California and she moved their with them.

anon 08 Feb 2017, 07:57

Mine started at -.50 and -.75. Shortly after went for drivers test and passed the vision part without the glasses. Wore them mostly for night driving, not even TV. Also began wearing for day driving. After a while began noticing more blur without them so wore them more often. Had another exam and came out with -.75 and -1.00. Think I would fail the test today.

Mike 07 Feb 2017, 17:52

Anon, is your prescription similar?

Anon 07 Feb 2017, 14:45

In other words, Ben, it IS a one way street. Not necessarily bad, if you can see better, but I think that any time you adjust to wearing glasses it is almost always one way. I was like you, and thought I didn't really really need them, and tried for a week, and as I noticed more and more how I could not make out out signs and even not so distant phone numbers I realized I had to go full time!

Cactus Jack 05 Feb 2017, 19:04


It is a common experience, but people with low myopia have less trouble switching from glasses to no glasses after they get used to seeing well with glasses. It really is your choice, with the exception of situations where poor vision affects the safety of other, such as driving.

More likely, you will decide that you prefer your vision with your glasses. Vision actually occurs in the brain. Your eyes are merely biological cameras. You brain corrects what you "see", IF it knows what you are looking at. Your brain can even generate images with your eyes closed. Ever had a dream?

Part of the suggested two week process is to let your brain learn to deal with images that have been corrected optically. In some ways, it is like a computer algorithm. The brain does not forget an image processing algorithm, but it may complain about having to re-load an algorithm that means it has to go back to work. Like any labor saving tool, it is hard to go back to not using the tool after you have experienced the difference and the comfort.


Ben  05 Feb 2017, 14:16

A friend told me that if I wear glasses full time for 2 weeks then without them everything will be so blurred that I will have no choice but to wear then full time.

I am concerned about taking a chance from not needing them to being dependent?

Is this common?

Soundmanpt 05 Feb 2017, 10:21


Of course you don't have much choice if you have been told that she needs to wear glasses then you should order them as soon as possible for her. At 6 years old she needs good vision so she can learn and be having trouble seeing at school. Just curious is your daughter small for her age? Because she is only 6 her eyes maybe just slow developing. Her eyesight isn't by any means terrible even if you weren't able to see anything through her prescription. But if your nearsighted that even would make it harder for you to focus with what her glasses would be. And if she is in fact just slwo with her eye development it is very possible that her need for glasses will slowly be reduced and maybe go away completely but that is very hard to predict. That is something you can ask about when you go back to have her re examined Now don't be upset if after she wears her glasses full time for those first 2 weeks and sh goes back for her re exam that they might increase her prescription a bit more. I'm pretty sure the went on the weaker side to let her eyes adjust to her glasses so they will know exactly what she needs. But again as she grows up her need for glasses could lessen or increase.

Cactus Jack 05 Feb 2017, 08:59


Unfortunately, that won't work. A narrow field of view is a common complaint about low cost progressives. Premium progressives such as Varilux and other top of the line lens are advertised as having a wider field of view, but they are not cheap. I don't have much experience with progressives. I tried them several years ago and had the same problem. I went back to lined bifocals and trifocals after a week of trying to function with progressives and never looked back. I have never been afflicted with Vanity.


Frank 05 Feb 2017, 03:51


Thank you for your feedback. Your advice confirms what I already had in mind. I guess 5 BO it is.

If I may bother you with another question: As I mentioned, I wear an add to reduce the tendency to overconverge at near. However, with the progressives, I really have a crisp, but very narrow field of view when reading - I can't see a full A4 text line clearly without moving my head. (Note: I reduced the PD by 3mm as generally recommended.)

Do you see any value in reducing it to 2mm, or alternatively, to reduce the add (now +1.5) in order to widen the field of view for near vision, or will that lead to other problems?

Thank you for your helpful advice!


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