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Medical Forum / General / Vision / April 2007Toric contacts
Please could someone advise why toric contacts don't start till the prescription is -0.75? What happens to people who have a prescription less than that, is the astigmatism uncorrected with contacts? Thanks > Please could someone advise why toric contacts don't start till the > prescription is -0.75? What happens to people who have a prescription less > than that, is the astigmatism uncorrected with contacts? Thanks For astigmatism less than 0.75, the difference in corrected vision comparing spherical to toric is neglible and the toric lens is more expensive and less stable. So yes, for small astigmatism, it is uncorrected. Dr Judy Isn't also the case that sometimes someone will be given more sphere to compensate, like an extra .25 to compensate for .50 astigmatism? >> Please could someone advise why toric contacts don't start till the >> prescription is -0.75? What happens to people who have a prescription less [quoted text clipped - 6 lines] > >Dr Judy > Isn't also the case that sometimes someone will be given more sphere to > compensate, like an extra .25 to compensate for .50 astigmatism? yes. the spherical equivalent of 0.50 cyl is 0.25 sphere. Guest via MedKB.com schreef: > Isn't also the case that sometimes someone will be given more sphere to > compensate, like an extra .25 to compensate for .50 astigmatism? No, that's not useful. It does not change the best corrected vision acuity and even can cause a headache. Jan (normally Dutch spoken) > > [quoted text clipped - 10 lines] >Dr Judy > Less stable? I can't figure why you'd say that, assuming we're not talking RGP torics or something, which for such low cyls wouldn't make much sense. In the case of toric soft lenses, there is no reason that .5 or even .25 couldn't be made, other than economics. And a .5 or .25 cyl soft toric should be every bit as, if not more, stable than a .75 or 1.00 cyl toric. w.stacy, o.d. >Please could someone advise why toric contacts don't start till the >prescription is -0.75? Some start at -0.50. >What happens to people who have a prescription less than that, is the >astigmatism uncorrected with contacts? Typically, yes. > Please could someone advise why toric contacts don't start till the > prescription is -0.75? What happens to people who have a prescription less > than that, is the astigmatism uncorrected with contacts? Thanks > > -- > Message posted viahttp://www.medkb.com in some cases the right spherical cl can correct some of the astigamatism. Surfer via MedKB.com schreef: > Please could someone advise why toric contacts don't start till the > prescription is -0.75? What happens to people who have a prescription less > than that, is the astigmatism uncorrected with contacts? Thanks Some soft contactlenses come with a 0.5 cylinder. Having said that, many times I try out what comforts the client better, whitout or with the -0.75 cylinder if this type of lens fits the client better instead of the lenstype with a 0.5 cylinder. Jan (normally Dutch spoken) |
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