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Medical Forum / General / Vision / September 2005Prescription for astigmatism only
This is my prescription: Right eye: (12°, -1.75) - 2.50 Left eye: (6°, -2.00) - 2.75 I've become more myopic, another -0.25 in my left eye, mainly because I've been spending too much time in front of the computer screen. My ophto told me that my myopia could decrease if I stop my screen work. In fact, I would like to know if I could order a pair of glasses with the full correction for my astigmatism and not a full correction for my myopia for computer use. Is this possible? Otherwise, I will just get more myopic as the years go on, but I still need to wear my glasses because even close-up things now seem blurry since I'm so astigmatic! This is the start of another myopia prevention thread, unfortunately. You will get wildly different opinions here, but in the end, yes you can and nobody knows for sure if it will do you any good or any harm, but probably will not do the latter... w.stacy, o.d. > This is my prescription: > Right eye: (12°, -1.75) - 2.50 [quoted text clipped - 9 lines] > more myopic as the years go on, but I still need to wear my glasses > because even close-up things now seem blurry since I'm so astigmatic! Dear Nicole, This is my prescription: Right eye: (12°, -1.75) - 2.50 Left eye: (6°, -2.00) - 2.75 These "prescriptions" seem unusual. The more "standard" way is to write 12 degrees as 12 diopters -- just to avoid confusion. Astigmatism is normally written as a cylendar in diopters, like -1.0, at an angle, say 45 degrees. To answer your question, yes you can obtain a lower-power minus lens for "near" work. The minus-diopters prescription is typically reduced by about 2 diopters. If you are wearing contacts, you can simply buy a +2.00 diopter "reader" over-the-counter. And yes, the topic of "slowing down" myopia is indeed a "hot" topic with NO RESOLUTION at this time. The is why there is a "second opinion" on the subject. Best, Otis (Engineer) Nicole wrote >This is my prescription: >Right eye: (12°, -1.75) - 2.50 The more "standard" way is to write 12 degrees as 12 diopters -- just to avoid confusion. So you think it's 12 diopters? Perhaps this is a notation you've never seen before? -MT (Actual reply relevant to Nicole is toward the end of rant to Otis) You should close your post with: "I'm not a doctor and have no real knowledge of vision care". You are such a looser, Otis and your comments are inappropriate for this forum. > This is my prescription: > Right eye: (12°, -1.75) - 2.50 [quoted text clipped - 3 lines] > These "prescriptions" seem > unusual. She just wrote it in a form with which you are not familiar. Try again, Otis. > The more "standard" way > is to write 12 degrees > as 12 diopters -- just to > avoid confusion. Loose the quotes. What you wrote is completely nonsense. There is no relationship between degrees and diopters. Give it up, Otis. > Astigmatism is normally > written as a cylendar in > diopters, like -1.0, at > an angle, say 45 degrees. Try" spell check". Oh, never "no mind". > To answer your question, > yes you can obtain a lower-power [quoted text clipped - 3 lines] > is typically reduced by > about 2 diopters. Typically? I think most of us in the profession try to calculate or measure in real space the actual amount of plus to add to the distance prescription to achieve appropriate visual comfort, accommodation and convergence. Of course you wouldn't know that as you have no background in vision science and have no business commenting without disclosing that fact. Back to Nicole's original query: If your (minor) increase in myopia is related to your focusing system being "stuck" from intensive near work, reducing the demand to focus is a reasonable choice to reverse that situation. It is certainly reasonable to use a reduced prescription for computer/near work, assuming your focusing/convergence system works correctly with it---something easily determined during an examination. Eliminating the entire myopia correction might be too much and create a blur at your desired near range, and again, something easily calculated or measured during and examination. Reducing your myopia power by about a diopter or so, one half in your situation, your likely prescription might be something like: R = -1.25 -1.75 X 12° L = -1.50 -2.00 X 6° LB, O.D. Dear Larry, Since I don't "prescribe" anything, I have seen only US prescriptions. Where did calling diopters "degrees" come from. Who developed that idea and why? I have seen it before -- but not in any text book on the subject. As long as the 12 degrees is an angle, then the issue is clear. For the technical person, I suggest the development of a low-cost trial-lens kit (not for prescribing) so that the person himself could understand how these measurements are made. This would be like the over-the-counter blood pressure measurement equipment available to the public. Good idea? Best, Otis > Where did calling diopters "degrees" come from. > Who developed that idea and why? Who calls diopters "degrees?" > As long as the 12 degrees is an angle, then > the issue is clear. Not really. > For the technical person, I suggest the development > of a low-cost trial-lens kit (not for prescribing) so > that the person himself could understand how > these measurements are made. > Good idea? A fine idea. Trial kits cost about $800, and you should include a small bottle of cyclopentolate because accommodation makes self-refraction virtually worthless. Of course you'd ignore astigmatism, because it's extremely tough to hold two or three lenses in place at one time. You could refract one eye at a time, and ignore the effects of binocular balance. Good luck getting a satisfactory prescription. For a somewhat better idea (still ignoring astigmatism), it's simpler and cheaper to make an optometer. They used to be available for ordering glasses by mail. Wonder why they quit doing that? -MT > For the technical person, I suggest the development > of a low-cost trial-lens kit (not for prescribing) so Here's a picture of the optometer: http://www.eyeantiques.com/EyeExamEquipment/Optometer.htm -MT Dear Nicole, This is my prescription: Right eye: (12°, -1.75) - 2.50 Left eye: (6°, -2.00) - 2.75 These "prescriptions" seem unusual. The more "standard" way is to write 12 degrees as 12 diopters -- just to avoid confusion. Dear Otis, The Rx is sometimes written this way in Europe. It transalates as follows: R -2.50Sph -1.75Cyl Axis 12 Roland Best, Otis (Engineer) I am surprised how stupid some people can be, perhaps this Otis guy is American! (joke!) Logically thinking, the ° symbol refers to degrees and, of course, astigmatism is measured in degrees. It certainly doesn't take a rocket scientist to work that one out. Yes, Roland this is the way prescriptions are written in some parts of Europe. I'm in France. Thanks for the postings made by the intelligent people, however. On 9/19/05 1:52 AM, in article 1127119933.420838.297960@g43g2000cwa.googlegroups.com, "nicoleh76@gmail.com" > I am surprised how stupid some people can be, perhaps this Otis guy is > American! (joke!) Logically thinking, the ° symbol refers to degrees [quoted text clipped - 5 lines] > > Thanks for the postings made by the intelligent people, however. Really. What does it mean if I have astigmatism of 22.5°? Moreover, what does it mean if I have cylinder of 1.00D at 30°? Is that astigmatism only? If I have a sphere of -0.50D and cylinder of 1.00D at 30°, is that not a better measure of astigmatism only? What about sphere of +0.50D and cylinder of -1.00D at -60°? 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