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Medical Forum / General / Vision / March 2009Unequal Powers
Hi, What would happen if the power in one side of a spectacle is greater or lesser than the other, for example, you have myopia of -3.0 OD and -4.0 OS and you are wearing a spectacle that is -3.0 OD, -3.5 OS. You missed 0.5D or even 0.25D in one eye. Would the eye that sees clearer gets overwork and fatique? What's the tolerence or power allowance before one has to change the glass? Does this situation affect accomodation or vengence of the eyes? What's all the hidden effects of this situation? Thanks. Willy Syler > Hi, > [quoted text clipped - 8 lines] > change the glass? Does this situation affect > accomodation or vengence of the eyes? Did you mean "vergence" or "vengeance?" They're vastly different notions ;-) > Hi, > [quoted text clipped - 5 lines] > 0.25D in one eye. Would the eye that sees > clearer gets overwork and fatique? The undercorrected eye would see a little bit blurry at distance. That may or may not cause headache or discomfort. With a difference as small as 0.50D, likely no effect. > What's the tolerence or power allowance before one has to > change the glass? When it bothers you, with headache or discomfort with near or far tasks. Some people are bothered by 0.50D difference, otheres are not bothered by a 2D or 3D difference. > Does this situation affec taccomodation or vengence of the eyes? No. >What's all the hidden effects of this situation? None. Dr Judy On Mar 27, 12:32 am, mpac...@rogers.com wrote: > > Hi, > [quoted text clipped - 9 lines] > That may or may not cause headache or discomfort. With a difference > as small as 0.50D, likely no effect. What Power Reserves (like Fusion Reserves) are involved in this? Would the corrected eye or undercorrected eye gets more myopic? Or let's go to a more neutral setting. Supposed a kid has a myopia of -0.5 in one eye and 0 in one eye. Would the eye with -0.5 myopia gets worse or the perfect eye becomes myopic? What usually happens? Thanks. Willy Sylers > > What's the tolerence or power allowance before one has to > > change the glass? [quoted text clipped - 12 lines] > > Dr Judy > On Mar 27, 12:32 am, mpac...@rogers.com wrote: > [quoted text clipped - 13 lines] > > What Power Reserves (like Fusion Reserves) are involved in this? Not sure what you mean by power reserves. Fusion reserves would not be affected. > Would the corrected eye or undercorrected eye gets more > myopic? Either or neither. Studies of this have had conflicting results. Or let's go to a more neutral setting. Supposed a kid > has a myopia of -0.5 in one eye and 0 in one eye. Would the > eye with -0.5 myopia gets worse or the perfect eye becomes > myopic? It is not possible to predict this. Either or both could get worse, Either or both could stay the same, Judy On Mar 28, 1:07 pm, mpac...@rogers.com wrote: > > On Mar 27, 12:32 am, mpac...@rogers.com wrote: > [quoted text clipped - 16 lines] > Not sure what you mean by power reserves. Fusion reserves would not > be affected. I asked my teacher what is meant by Power Reserves and even ask more details about Fusion Reserves. She told me to inquire at the Atomic Energy Commission. > > Would the corrected eye or undercorrected eye gets more > > myopic? [quoted text clipped - 9 lines] > It is not possible to predict this. Either or both could get worse, > Either or both could stay the same, So you are supporting Otis who is said to be the most brilliant of eye exercise guru in the world. W > Judy- Hide quoted text - > > - Show quoted text - > > It is not possible to predict this. Either or both could get worse, > > Either or both could stay the same, > So you are supporting Otis who is said to be the most > brilliant of eye exercise guru in the world. Gullible. -MT >> So you are supporting Otis who is said to be the most >> brilliant of eye exercise guru in the world. > Gullible. In fact, very few people achieve such extremes of gullibility. There is a high probability you are Zetsu. -MT In article <b3752aa4-4d25-4f6d-92e0-498f7c7b3c49@e2g2000vbe.googlegroups.com>, > > On Mar 27, 12:32 am, mpac...@rogers.com wrote: > > [quoted text clipped - 29 lines] > It is not possible to predict this. Either or both could get worse, > Either or both could stay the same, I have my own question here. To read this group, you would think that 90% of the people in the world are myopic. A lot of the questions have to do with how something or other will affect myopia. If these things *do* have an effect on myopia, wouldn't they have a similar effect on hyperopia?  SignatureDan Abel Petaluma, California USA dabel@sonic.net Dear Dan, Not in the "world", but the doctors themselves. Item: ============= MYOPIA PREVALENCE IS ALWAYS HIGHER THAN 92 PERCENT FOR TAIWAN MEDICAL STUDENTS o Lin et al (Lin, L.K., Shih, Y.F., Lee, Y.C., Hung, P.T., and Hou, P.K., " Changes in ocular refraction and its components among medical students - a 5-year longitudinal study", Optom. Vis. Sci., 73:495-498, 1996) found that in a study of 345 National Taiwan University medical students, the myopia prevalence increased from 92.8% to 95.8% over the five year period. ============ > In article > <b3752aa4-4d25-4f6d-92e0-498f7c7b3...@e2g2000vbe.googlegroups.com>, [quoted text clipped - 46 lines] > > - Show quoted text - On Mar 30, 7:58 am, otisbr...@embarqmail.com wrote: > Dear Dan, > [quoted text clipped - 14 lines] > prevalence increased from 92.8% to 95.8% over the five year > period. Wow. Steve Leung must feel like a total and utter failure, then, huh? Wow. Almost all Zulu are tall. It must be their lack of shoes. -MT Dear Dan, Not in the "world", but the doctors themselves. Item: ============= MYOPIA PREVALENCE IS ALWAYS HIGHER THAN 92 PERCENT FOR TAIWAN MEDICAL STUDENTS o Lin et al (Lin, L.K., Shih, Y.F., Lee, Y.C., Hung, P.T., and Hou, P.K., " Changes in ocular refraction and its components among medical students - a 5-year longitudinal study", Optom. Vis. Sci., 73:495-498, 1996) found that in a study of 345 National Taiwan University medical students, the myopia prevalence increased from 92.8% to 95.8% over the five year period. ============ On Mar 28, 8:24 pm, Dan Abel <da...@sonic.net> wrote: > In article > <b3752aa4-4d25-4f6d-92e0-498f7c7b3...@e2g2000vbe.googlegroups.com>, [quoted text clipped - 49 lines] > > - Show quoted text - |
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