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Medical Forum / General / Vision / June 2006effect of unwanted prism in glasses?
Hi, I recently got new glasses. Only trouble was, when I put them on, I saw double. Two people, two of everything etc. After investigation by the optician, she said it was because there was 'prism' in my old glasses and none in my new ones. The only trouble was, nobody in the past had told me I needed prism and it wasn't picked up in the examination I had for this current pair. The optician said it was possible that the people who made my glasses five years ago put prism in 'accidentally' and that my eyes are now 'used to prism', meaning I now need it regardless of whether I originally did or not. Does anyone know (or could hazard a guess) as to what would happen to 'normal' eyes after looking through prism glasses for five years? I have read that needing prism means you have a condition like 'lazy eye' - but I certainly don't have any obvious signs of my eyes going in different directions, so I'm a bit confused. Thank you in advance for any ideas! cheers, yorkie bar it depends on the prism induced. If it were vertical prosm, I would expect you would have noticed it immediately you got the original glasses, so I will assume it is horizontal prism. This is often induced when the lens fitter is lazy and doesn't decentre the lenses (common in Asia). Myopes cope very happily with the base in prosm induced, so they don't have to converge as much, but they hate it when they get their next pair and they are made correctly and have to converge again. You will adapt to it over time, but it can be an issue for a while. do you see double without glasses? If nothing is wrong with your eyes, give it time, youll soon get used to your new glasses and wont see double anymore acema...@yahoo.com wrote: > do you see double without glasses? If nothing is wrong with your eyes, > give it time, youll soon get used to your new glasses and wont see > double anymore Thank God for your follow up, Ace. Without it, the original poster would have had to take the word of an actual eye doctor. > acema...@yahoo.com wrote: > > do you see double without glasses? If nothing is wrong with your eyes, [quoted text clipped - 5 lines] > Without it, the original poster would have had to take the word of an > actual eye doctor. except for the fact im not a doctor. The doctors know what to do, one of them mentioned trying to unadapt to the prisms you dont need. > > acema...@yahoo.com wrote: > > > do you see double without glasses? If nothing is wrong with your eyes, [quoted text clipped - 8 lines] > except for the fact im not a doctor. The doctors know what to do, one > of them mentioned trying to unadapt to the prisms you dont need. And you felt compelled to write what was already written because.................. Find the off switch already. You have no value, no purpose here. The fact that you don't get that is proof enough that you don't. > Hi, > > I recently got new glasses. Only trouble was, when I put them on, I saw > double. Two people, two of everything etc. After investigation by the > optician, she said it was because there was 'prism' in my old glasses and > none in my new ones. Did you wear the new ones for a while? If the doubleness went away after a few minutes/hours, you may not have needed it. If it didn't, you do need it. If you didn't try them more than 10 seconds, all bets are off. > > The only trouble was, nobody in the past had told me I needed prism and it > wasn't picked up in the examination I had for this current pair. The > optician said it was possible that the people who made my glasses five years > ago put prism in 'accidentally' and that my eyes are now 'used to prism', > meaning I now need it regardless of whether I originally did or not. Possible, but not likely. > Does anyone know (or could hazard a guess) as to what would happen to > 'normal' eyes after looking through prism glasses for five years? No guess at all. Normal binocularity adapts readily to prism in most cases, both horizontal and vertical, and in surprising amounts. Takes a while, but does happen for normals. People who need prism don't adapt as well to erroneous prisms. A normal who so adapts to an inadvertent prism will take about as long to "unadapt" as the initial adaptation took. > I have read that needing prism means you have a condition like 'lazy eye' - > but I certainly don't have any obvious signs of my eyes going in different > directions, so I'm a bit confused. Most binocular imbalances are not so great as to cause an obvious eye turns. w.stacy, o.d. |
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