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Medical Forum / General / Vision / February 2007New prescription
I have just got a prescription that reads -1.25 -2.50 -0.25 x 140 A friend tells me that a 1.25 difference between the eyes is quite big and that the difference will make it uncomfortable. She has a difference of 1 between her eyes. My old prescription was -1.25 and -1.50 and I didn't notice the difference between them. Now I have the extra -1 will I end up having to wear them for most of the time? > My old prescription was -1.25 and -1.50 and I didn't notice the difference > between them. Now I have the extra -1 will I end up having to wear them > for > most of the time? The new glasses will probably feel weird at first. If you don't get used to it, there are several techniques for reducing the discomfort. Whether you wear them "most of the time" is a matter of preference. The only time you "have to" wear them is driving. You might wear them more than usual for a while, to make sure you can get used to them. -MT Why might they feel weird? Is there something unusual about the prescription? Laura > Why might they feel weird? Is there something unusual about the > prescription? The additional minus will make objects appear a little smaller and a little more bowed ("barrel") in one eye. When _both_ eyes need stronger lenses, the change in size and shape pretty easily tolerated. Reducing image size in one eye compared to the other creates a slight visual "twist" since the left eye sees things as if they are further away. Usually it just takes a few days to acclimatize. Many people adapt with no trouble at all. -MT >I have just got a prescription that reads > -1.25 > -2.50 -0.25 x 140 > > My old prescription was -1.25 and -1.50 and I didn't notice the difference And let me be the first to express a little suspicion about the validity of your refraction. Advancing -1.25 in one eye with _no_ change in the other is a little unusual. It's one of those changes that a good refractionist would check three times before committing to it. If he or she didn't fuss over the left eye during refraction, ask them to repeat the test on another day before before making glasses. -MT Dear Friend, Subject: Errors in a prescription. Some times errors are made even by careful ODs. You might check this yourself with this Snellen. Just click on: http://www.smbs.buffalo.edu/oph/ped/IVAC/IVAC.html And then press "Display". In general your -1.25 diopter eye will see the 20/60 line. If the other eye is -2.5 diopters, then your Snellen would be about 20/170. Why not check this an post what you read on your Snellen. Perhaps some of the experts can help you if you post your results. Best, Otis > I have just got a prescription that reads > -1.25 [quoted text clipped - 9 lines] > -- > Message posted viahttp://www.medkb.com I did the test and could see the 20/60 line and with the other eye I could just make out the 20/200. I could see it was a Y but it was quite blurry. > I did the test and could see the 20/60 line and with the other eye I > could just make out the 20/200. I could see it was a Y but it was > quite blurry. Laura, Please disregard Otis's postings. He is not in the medical profession and not in any position to give medical advice. Thanks! Allen Dear Laura, Those values of visual acuity are close to the prescription you received. Looks like all is in order for you. Try to ingnore Allen Liberman. He thinks everyone is too stupid to do these wise checks themselves as you have done them. Best, Otis > I did the test and could see the 20/60 line and with the other eye I could > just make out the 20/200. I could see it was a Y but it was quite blurry. > > -- > Message posted via MedKB.comhttp://www.medkb.com/Uwe/Forums.aspx/vision/200702/1 > Looks like all is in order for you. Dear Laura, Please disregard Otis's postings. He is not in the medical profession and not in any position to give medical advice such as above. Thanks! Allen > I have just got a prescription that reads > -1.25 [quoted text clipped - 6 lines] > between them. Now I have the extra -1 will I end up having to wear them for > most of the time? I don't think that it is that big of a difference. I'm not a doctor. Perhaps you should consult your doctor, although normally you will be warned if there is a potential problem. I had a difference of 12, which is a big deal. I switched to contacts. After some time, I could use glasses, although I think I only saw out of one eye. The glasses change the size of the image. The brain normally merges the images from the two eyes. If the images are too different in the size, the brain can't merge them and you see double. 12 is alot but must be unusual. What difference might someone have that is big enough to be visually disturbing if they don't wear glasses? > 12 is alot but must be unusual. > > What difference might someone have that is big enough to be visually > disturbing if they don't wear glasses? If someone doesn't wear glasses, it is unlikely that they have a significant difference, or else they see only out of one eye. If they wear contacts, that doesn't cause a problem. I wore contacts for many years for that reason. |
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