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Medical Forum / General / Vision / August 2006Red/green eye chart
What is the red/green chart my eye doc has me looking at? He wants to know whether the letters are darker/clearer in the red half or the green half. I guess it has something to do with distance vs. near, but I don't really understand how that works. -- > What is the red/green chart my eye doc has me looking at? He wants to > know whether the letters are darker/clearer in the red half or the > green half. I guess it has something to do with distance vs. near, but > I don't really understand how that works. Nothing to do with distance vs near. It's one of the tests to check whether your refraction is "balanced" (each eye has the same accommodative demand at distance). The end point is to have both eyes in the red or in the green or the same. It works because red light will have a slightly longer focal length than green light for the same power lens so if either red or green is clearer in one eye then the sphere power needs to be adjusted for one eye. Following the balance test there will be a final blilateral determination of sphere power. Some people use that method of balance, there are others. Dr Judy > > What is the red/green chart my eye doc has me looking at? He wants to > > know whether the letters are darker/clearer in the red half or the > > green half. I guess it has something to do with distance vs. near, but > > I don't really understand how that works. Did you ask your doctor? I often wonder why questions such as these are seen so commonly in the newsgroups. I pride myself on answering all of the patient questions I can. I know I would feel bad if a patient of mine asked the question here. So much for the sidebar... I would add to Dr. Judy's response is that the reason the Rx needs to be balanced is that the two eyes cannot focus / accommodate independently. Therefore, if we leave one eye too strong for distance it can destabilize the vision in the fellow eye. The red-green balance gives us mildly quantifiable means to determine whether one eye is focusing more than the other. > I often wonder why questions such as these are > seen so commonly in the newsgroups. That's a rhetorical question right? Certainly many people are intimidated in the presence of a professional. Especially so in medical and either don't want to risk asking what might be considered a dumb question or don't know the question to ask in the first place. Later you have time to think about it, formulate the question and ask it in the relaxed, protected, anonymous context of a forum. It takes some real talent to be able to instantly guage a person's level of understanding and then efficiently explain very complex and technical concepts and procedures appropriately. All without detracting from your primary job. At one extreme you're teaching at a school and at the other you have zero bedside manner. I think you could give a constant running commentary on everything you do but I think it would be exhausting and a less efficient use of your time and energy. Less patients receiving less care. tough balancing act. -Quick -Quick I tend to ask quite a few questions at the eye doc's office. Especially when I was getting vision therapy, I asked all the time, but eventually they get annoyed, I think because they think I'm questioning the validity of what they are doing - doubting them. Also, eye docs, in my experience, seem to always be in a hurry and I get the feeling I'm putting them out by asking questions. In another thread I asked about doing the refraction from a monitor only 5 feet away. I didn't understand how he could get an accurate result that way, especially when I was complaining of being only about 0.25D off at distance. I mentioned this and the answer was "we compensate for that". I left it alone at that even though I wasn't really satisfied. I'm still not, even though I was given an answer here. > > I often wonder why questions such as these are > > seen so commonly in the newsgroups. [quoted text clipped - 24 lines] > > -Quick -- Dear Charles and "Quick", Subject: General questions -- outside the office. As I recall, on OD said that chares for an exam run between $120 to $400 plus. Obviously, that leaves very short time for "questions", and particularly if the "answer" requires a substantial review of many issues. Thus you "innocent question" about the effect of a minus lens on the refractive STATE of the eye MIGHT require more time to answer in an "office" with the time available to answer the question as completely as possible. The only other possibility is that you get "short shrift" for your question -- or insulted in some manner. Or you are intimidated by the short-shrift answer. Thus the value of sci.med.vision to fully explore the implications of your question and to develop and accurate answer -- and to understand the "context" of your question. Best, Otis > I tend to ask quite a few questions at the eye doc's office. > Especially when I was getting vision therapy, I asked all the time, but [quoted text clipped - 41 lines] > > -- > As I recall, on OD said that chares for an exam run > between $120 to $400 plus. Where? Not in my neighborhood. > Obviously, that leaves very short time for "questions", > and particularly if the "answer" requires a > substantial review of many issues. Or a physics lesson. > Thus you "innocent question" about the effect > of a minus lens on the refractive STATE of > the eye MIGHT require more time to answer I thought the questions were about the red-green balancing technique and four-meter refractions. If you were on topic, you could be explaining these for us now. > Thus the value of sci.med.vision to fully > explore the implications of your question > and to develop and accurate answer -- and > to understand the "context" of your question. So let us know when you're ready to "develop and accurate answer." -MT Subject: Mono-vision versus "balancing" the eyes to be identical in terms of refractive STATE. As you know, some people need an intentional, induced DIFFERENCE in refractive STATE between the eyes, to "overcome" presbyopia. Thus SOME people prefer this -- and it works. Others, like Charles can not tollerate it. Other people have "natural" monovision, i.e., they will have a difference of 1.5 diopters between their eyes, with one eye's refractive state at zero, and the other at -1.5 diopters. Thus this explains why SOME people NEVER need a lens -- because of this natural DIFFERENCE. It would make no sense to "correct" this with "balance" when it is of great value to KEEP this difference between the eyes. Best, Otis I thought the questions were about the red-green balancing technique and four-meter refractions. If you were on topic, you could be explaining these for us now. > > As I recall, on OD said that chares for an exam run > > between $120 to $400 plus. [quoted text clipped - 23 lines] > > -MT > of this natural DIFFERENCE. It would > make no sense to "correct" this with "balance" > when it is of great value to KEEP this > difference between the eyes. We're so lucky to have you dictating our standards of care. -MT I think it is a shame so many patients feel intimidated or rushed or taken for granted so that they have to come to a forum where the quality of the answers and the agendas of the answerers are uncontrolled. I guess that is why I run behind schedule most days. Also, I believe many of us do not use a specific balancing test for patients with moderate or more presbyopia, so the "needing an imbalance" to adapt to presbyopia would not be part of the development of and accurate answer. Dr. ABS > I think it is a shame so many patients feel intimidated or rushed or > taken for granted so that they have to come to a forum where the > quality of the answers and the agendas of the answerers are > uncontrolled. I guess that is why I run behind schedule most days. ... > Dr. ABS Not to be too cynical, but I don't always feel like I get unbiased info from my OD because I sense that he is (a) in a hurry, (b) somewhat defensive of a "questioning" patient, (c) wants me to go away without the hassle and expense of changing my Rx, and (d) not necessarily as up to date as the OD's on here who clearly take a personal interest in patients and optometry. Regarding the last point, the last two OD's I've seen only came in two days a week. Is this common? Are they treating it as a part time job, or are they probably doing some other optometry related thing outside of the practice? Sometimes this makes me question their dedication, and the likelihood that they are up to date in the field. Aside from a few trolls (not OD's anyway), I think that the OD's on this forum are likely to give their honest opinion, since they have no personal involvement in the situation. If they bother to monitor a forum on their free time, I expect that they are also reading up and are familiar with the latest products and research. -- |
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