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Medical Forum / General / Vision / June 20052 contact lens questions
1- Do both lenses have to be the same type? My wife has a toic lens to correct asigmatism in one eye, but why does she have a toric lens for the other eye? Are we getting screwed? 2- With soft disposible lenses is there really any risk to different BCs other than fit? My Dr is thinking of switching me from a 8.7 to a 8.2, and maybe to a different brand with a 8.4. It seems pretty hap-hazerd. > 1- Do both lenses have to be the same type? My wife has a toic lens to > correct asigmatism in one eye, but why does she have a toric lens for the > other eye? Are we getting screwed? It's hard to be sure about this without seeing her eyeglass prescription. Most of the time there's similar astigmatism in the other eye, though it may be less. Exceptions exist, but astigmatism isn't usually significant in soft lenses if her "cylinder" (the second column in the the eyeglass prescription) is 0.50 or less. > 2- With soft disposible lenses is there really any risk to different BCs > other than fit? My Dr is thinking of switching me from a 8.7 to a 8.2, and > maybe to a different brand with a 8.4. It seems pretty hap-hazerd. Fitting too tight has its risks, but that's why we inspect the fit in the microscope each time the base curve is changed. Tighter base curves (like 8.3 and 8.4) can help comfort, and the stability of torics. Trying several, and inspecting each one, is the _best_ service you can get. At the other end of the spectrum are the (apparently very competent) doctors who read numbers off an instrument, write a prescription and then say "Torics just don't work for you" or the favorite "Your eyes are just dry. Get used to it." -MT >> 1- Do both lenses have to be the same type? My wife has a toic lens to >> correct asigmatism in one eye, but why does she have a toric lens for the [quoted text clipped - 15 lines] > microscope each time the base curve is changed. Tighter base curves (like > 8.3 and 8.4) can help comfort, and the stability of torics. Are there risks with being fitted too loose or i sthat just a comfort thing? > Trying several, and inspecting each one, is the _best_ service you can > get. At the other end of the spectrum are the (apparently very competent) [quoted text clipped - 3 lines] > > -MT > Are there risks with being fitted too loose or i sthat just a comfort > thing? I don't think I've ever seen harm from a too-loose lens. It feels dry sooner, it pops out, and it's difficult to insert. It might cost twice as much because the dry sensation increases day by day and they're replaced more often. -MT There is perhaps the risk of developing giant papillary conjunctivitis from the constant rubbing of the edge of the contact lens against the superior palpebral conjunctiva.... DrG > There is perhaps the risk of developing giant papillary conjunctivitis > from the constant rubbing of the edge of the contact lens against the > superior palpebral conjunctiva.... Perhaps, but when a lens moves more with blinking, it's rubbing the globe more and thereby _less_ against the palpebral conj. -MT ...which ultimately happens with GPC. The lens adheres to and moves up with the lid. I don't know about your experience, but in the presence of GPC, I always go steeper. Actually, I go in the direction of less edge-lift, which does not necessarily mean steeper. DrG |
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