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Medical Forum / General / Vision / May 2006Best correctable?
How common is it to be unable to read all of the test chart? With correction I can get the third line down, and maybe 2nd, with one eye but very little of the 3rd line with my other eye. My eye dr says it's the best he can do. Is that usual? Should I be concerned? Dear Chingo Belle, Subject: Visual Standards The standard is 20/20 -- and the ablity to read 1/2 the letters on that line. That is excellent vision. The letters are 3/8 inch and must be read at 20 feet (standard). In metric, it is 0.9 cm letters at 6 meters. (These aret tests for nearsighedness.) Tests for near vision are slightly different. Hope this clarifies your question. Best, Otis > Dear Chingo Belle, > [quoted text clipped - 4 lines] > > That is excellent vision. Wrong again, you useless old man. Go look it up and tell us why your answer is wrong (hint: there are two errors.) Not to mention you didn't even answer the poster's query, not that you would impart any valuable information in any event. So so sad. LB, O.D. > Dear Chingo Belle, Dear Chingobell, Please disregard Otis's postings. He is not in the medical profession and not in any position to give medical advice. Thank you! Allen what is your pescription? If you are highly myopic, the spectacle minification will make the 20/20 line too small > How common is it to be unable to read all of the test chart? With correction > I can get the third line down, and maybe 2nd, with one eye but very little of > the 3rd line with my other eye. My eye dr says it's the best he can do. Is > that usual? Should I be concerned? I'd be more concerned about the unequal vision between the two eyes. But.... You really haven't provided enough information to comment --- we really don't know what size those "2nd" and "3rd" lines are. On some eye charts the bottom line is 20/10, others (most) 20/15. Top can be 20/200 or 20/100. Are you measuring from the top or bottom? (USA notation above.) If you are concerned about the test results, ask your eye doctor to explain them to you. If you are still unclear about the meaning, go and seek an opinion from another eye doctor. LB, O.D. >> How common is it to be unable to read all of the test chart? With correction >> I can get the third line down, and maybe 2nd, with one eye but very little of [quoted text clipped - 8 lines] >the bottom line is 20/10, others (most) 20/15. Top can be 20/200 or >20/100. Are you measuring from the top or bottom? >(USA notation above.) > [quoted text clipped - 3 lines] > >LB, O.D. Thanks for the replies. My prescription is -2.50 and -2.75. I'm afraid I don't know whether the top line was 20/100 or 20/200. With the worse eye I could barely make it out, does that give a clue? The lines I was originally referring to were from the bottom. What did you mean when you said you'd be more concerned about the unequal vision between the two eyes please? The eye dr was quite thoro' in his testing and explained what he was doing throughout. I figured I just needed a bit of an increase so I was surprised to hear him say it was the best he could do. If you are legal to drive, you have at least 20/40 correctable vision. If you can barely make out the 20/200 line, this is probably your uncorrected vision. Lets assume the bottom line is 20/10 then the 2nd line may be 20/15 and the third line 20/20. Yet if your optometrist said thats the best he could do, perhaps you corrected only to 20/30? Keep in mind that 20/20 is perfect vision and alot of people will fall just short of that. I can correct to 20/25 to 20/30 in the better eye and the worse eye is a blurry 20/30. >If you are legal to drive, you have at least 20/40 correctable vision. >If you can barely make out the 20/200 line, this is probably your [quoted text clipped - 4 lines] >just short of that. I can correct to 20/25 to 20/30 in the better eye >and the worse eye is a blurry 20/30. Please try to ignore acemanvx@yahoo.com and otisbrown@pa.net Your eyesight may depend on it. Regards, Neil >How common is it to be unable to read all of the test chart? With correction >I can get the third line down, and maybe 2nd, with one eye but very little of >the 3rd line with my other eye. There is no universally used chart where one can know from your description your best corrected visual acuity. >My eye dr says it's the best he can do. Is that usual? Should I be >concerned? You are obviously concerned. Your eye doctor should be able to tell you your best corrected visual acuity in each eye, and if that visual acuity is "normal" (i.e., 20/20). And if it is subnormal, he should be able to give you the etiology of it. And if he cannot, he should recommend/refer you to another eye doctor in order to attempt to obtain an explanation for the subnormal visual acuity.
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