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Medical Forum / General / Vision / August 2008trapezoid vision with new eyeglasses
This is the first time I am using prescription eyeglasses. My RX is: right: -.75 sph, left -.25 -1.25X180. When I look at my computer screen with the glasses on, the screen looks like a trapezoid on its side. The right side is narrower than the left. The effect is not as noticable when I look at distant objects, like TV from a distance. What can be a cause of this? Is it just an adjustment period, since I haven't used Rx glasses before? Thanks, Mike > objects, like TV from a distance. What can be a cause of this? Is it > just an adjustment period, since I haven't used Rx glasses before? It's typical to feel that way for a few days, even more, with your first pair. Lenses that change the focus of light have inevitable side effects leading to distortion like this. Fitting the lenses close to your eye can minimize the effect, so frame selection and frame adjustment can help, but only so much. The only other way to reduce it is to have the glasses remade less sharp. Usually it becomes a non-issue when you get used to it. -MT Do you mean the effect goes away after I get used to the glasses and then I start seeing rectangles properly again? or will it stay the same but won't bother me much? Do contact lenses have the same effect? I may consider switching to them if they don't have any of these problems. I thought it might be an issue with the lenses and was going to ask them to be redone. It's too bad if I am stuck with the distorted vision. Thanks for the answer! Mike > > objects, like TV from a distance. What can be a cause of this? Is it > > just an adjustment period, since I haven't used Rx glasses before? [quoted text clipped - 12 lines] > > -MT "Spintronicus" <spintronicus@gmail.com> wrote . > Do you mean the effect goes away after I get used to the > glasses and then I start seeing rectangles properly again? Yes. > or will it stay the same but won't bother me much? Yes. :) Both statements are true to some extent, because your perception of "square" is fluid enough that your brain wraps itself around a new perception after a few days or a couple of weeks. To accellerate the adaptation, wear them full-time at first. > Do contact lenses have the same effect? They would, if they were worn the same distance off your eye. The distortion is multiplied by the distance between the lens and the eye, which is near zero with contacts. > I may consider switching to them if they don't have any of these > problems. They have their own problems. Wait and see how this goes. If you get headaches, or you can't tolerate the effect after 2-3 weeks, take them back and ask if the Rx might be too strong. > I thought it might be an issue with the lenses and was going to ask > them to be redone. It's too bad if I am stuck with the distorted > vision. Re-doing with the same Rx and the same frame would change nothing. Adjusting the frame so the lenses fit closer to your eyes can make a lot of difference. -MT Thanks a lot for the answers, but my whole plan was to use the eyeglasses only occasionally, while driving, watching TV, etc. If my brain adjusts to the distorted vision with the glasses, would I start seeing trapezoids when I am not wearing them? :) > "Spintronicus" <spintroni...@gmail.com> wrote > . [quoted text clipped - 35 lines] > > -MT >Thanks a lot for the answers, but my whole plan was to use the > eyeglasses only occasionally, while driving, watching TV, etc. I only said wear them full time "at first." > If my > brain adjusts to the distorted vision with the glasses, would I start > seeing trapezoids when I am not wearing them? :) But nobody complains of that, despite the fact that lots of people wear glasses stronger than yours. Adapting to the new perceptual framework doesn't eliminate your ability to perceive "square" when the distortion is taken away. Like learning French doesn't make you forget English. It's a good bet that it won't bother you a week from now. If it does, adjustments like "face form" sometimes make a dramatic difference, and if not, a remake with new frames, or a customized fitting height, vertex distance, or base curve can all be manipulated to reduce the effect. The lens material, index of refraction and Abbe' number won't matter so much in your case. -MT |
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