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  • New Glasses - They're Making Me Carsick (p.5)
2016/07/29 18:58:25
kitekrazy1
bitflipper
Any keyboard players here wearing progressive lenses? Is it something I can get used to over time?
 
It's only been a couple hours since I picked up these new glasses, and I feel seasick. My keyboard looks like it's warped and has waves in it when I move my head. Played a video game on my tablet and everything was warped, rectangles looking like parallelograms and circles like ovals. I've got that nauseous feeling you get from reading in the car.
 
Should I just be patient, or should I get another pair of glasses before my eyes go all googley?




 I worked in the optical business for 15 years. I've made them and fitted them.
 
Did you wear any multifocal lenses before?
 
The lens is funnel shaped. You have to turn your head left and right,  move eyes up and down for distance.
 
The frame could also be part of the problem. So my frame designs are so small vertically to make use of these lenses.
 
 If it you are not use to them by 2 years they are probably not for you. I have a pair and don't use them a lot. There is nothing wrong with them it's that I don't need any distance correction. Most of the time at home I use readers. After 50 years of existence was the first time I needed any glasses and basically for reading. So wearing glasses isn't I usually do.  Progressive take time to know how to use them. 
 
 
 
 
2016/07/29 19:11:44
kitekrazy1
DrLumen
Leadfoot
A couple things that can cause the effect you're describing: If you switched materials. Say your old lenses were CR-39(plastic), and you switched to polycarbonate or hi-index. Another thing that will cause the issue is when they change base curves, which is the front curve of the lens. These two things will cause your problem. I would suggest taking your old and new glasses back in and having them compare materials and measure the base curves of both. I would bet that there's a difference.



It's been about a year now but the hi-index sounds familiar. I always get the highest density material so a material change was very likely. Each time I go there is some newfangled plastic. I'll also keep that base curve info in mind as well. Thanks for tips.




The curve has to do with your prescription. Some are borderline where there are two options. Most lenses are polycarbonite where as Leadfoot mentioned traditional plastic is CR-39.  Poly lenses can be ground much thinner. How they are edged down and put into a frame can make a difference.  Also be far or near sighted has a lot to do with it.   
2016/07/29 19:29:44
Leadfoot
kitekrazy1

The curve has to do with your prescription. Some are borderline where there are two options. Most lenses are polycarbonite where as Lead plastic is CR-39.  Poly lenses can be ground much thinner. How they are edged down and put into a frame can make a difference.  Also be far or near sighted has a lot to do with it.   

The back curve is where your prescription is ground. The front curve is what I was referring to. Let's say someone who is a relatively high minus goes from a 2 base to a 4 base, or vice versa, there will be a perceptible difference, even if the Rx is exactly the same. The light is being bent differently because not only is the front curve different, the rear curve will be different too, to compensate for the difference in the front.
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