Eyeglasses - difficulty getting a 'workable' prescription
Jun 1st 2016, 9:05 am
#16
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Re: Eyeglasses - difficulty getting a 'workable' prescription
I can see in the distance TODAY with glasses that were prescribed as reading glasses 3-5 years ago. In reviewing all my past prescriptions, I noticed that the 'reading' prescription and the 'distance' prescription differed only in the magnitude of the 'Sphere' numbers (no change in 'Cyl' and 'Axis'), and with each successive year (or two) the numbers both increased in step. In fact, some prescriptions handle the 'reading' prescription by simply having a column 'Add' (add this amount for the reading glasses).
I should possibly add, what I'm calling 'reading' casually here, were actually requested as 'computer' glasses. I believe 'computer' glasses get less magnification relative to classic 'reading' prescriptions.
I should possibly add, what I'm calling 'reading' casually here, were actually requested as 'computer' glasses. I believe 'computer' glasses get less magnification relative to classic 'reading' prescriptions.
Sorry no ideas on the problem. I wear varifocals and they seem OK, I just had to get used to moving my head to find the right part of the lenses, and be careful on stairs.
Jun 1st 2016, 9:15 am
#17
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Re: Eyeglasses - difficulty getting a 'workable' prescription
Jun 1st 2016, 9:29 am
#18
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Re: Eyeglasses - difficulty getting a 'workable' prescription
Some people are also sensitive to (some term/concept I can't describe right now, would have to research it) that relates to the curvature of the lens. Basically, as you look through the lens, your eye is affected by the 'offset' when looking anywhere but straight ahead. Some sports people have wrap-around lenses, where the entire lens is curved, so that at any point, your eye is looking through the lens at 90 degrees to the surface. I forget what the jargon is for this but worth looking into perhaps.
I'm still on the look out for something not so mental that has vented lenses for mountain biking. The other frames I've seen, the lenses either rest heavy on the cheek bone, or the arms bow out a bit and aren't comfortable with a helmet on...and anything to thick or close to the cheek is waiting to get smashed when the inevitable bail happens
Jun 2nd 2016, 9:32 am
#19
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Re: Eyeglasses - difficulty getting a 'workable' prescription
I've always had this problem to a degree - I need glasses for distance vision, but I've also got slight astigmatism and I've been told that a degree of my short-sightedness is not due to the eye/lens itself, but the muscles that hold and shape my eyes. I've never had a consistent prescription, it's always changed between check-ups - my eyes get worse if I do a lot of close work (studying/computers) and better if I'm out and about looking over long distances. Add in opticians that like to prescribe lenses that take my eyes to 40:20, then I really struggle.
What I've found the worst is when my eyes are not corrected equally. My current glasses are pretty much perfect for my left eye, but over-correct my right eye, and that imbalance can give me a headache at the end of a long day. And these glasses took a couple of goes to get right at the optician - and to be fair, if my eyes can give different readings on different days, then getting a correct prescription is always going to have an element of luck.
What I've found the worst is when my eyes are not corrected equally. My current glasses are pretty much perfect for my left eye, but over-correct my right eye, and that imbalance can give me a headache at the end of a long day. And these glasses took a couple of goes to get right at the optician - and to be fair, if my eyes can give different readings on different days, then getting a correct prescription is always going to have an element of luck.
From 2013:
Code:
Sphere Cyl Axis OD (Right) 2.5 1.00 165 OS (Left) 1.5 1.25 20
Jun 2nd 2016, 10:36 am
#20
Deep in the woods of CT
Joined: Feb 2010
Posts: 7,016
Re: Eyeglasses - difficulty getting a 'workable' prescription
My eyes are quite different, unfortunately, and I'm sure that has a bearing on the issue. One is quite bad (Right), the other not so bad.
From 2013:
Difference was greater, in the past (2 units different on the 'sphere' 15 years ago, now only 1)
From 2013:
Code:
Sphere Cyl Axis OD (Right) 2.5 1.00 165 OS (Left) 1.5 1.25 20
I have a -6.25 on the right eye sphere, and a -0.25 on the left -- a really crazy difference! I wear a -5.50 lens in my right eye only and that works perfectly.
Jun 2nd 2016, 9:40 pm
#21
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Re: Eyeglasses - difficulty getting a 'workable' prescription
I just took on bifocals and am seeing things on the periphery (briefly) that just aren't there, and turning to look behind for traffic while crossing the road takes a little concentration. Curbs are OK but stairs.. that's what handrails are for.
