This study examined the flexure of the Boston II gas-·permeable contact lens, while varying center thickness (.10mm, .14mm, .18mm) on with-the-rule corneas ranging from 1.12 to J.J1 D. All lenses were fit steeper than the flattest "K". It was found that contact lens with-the-rule: flexure occurred on all the eyes studied, but I was seen to be less as center thickness was increased. The base curve-cornea fitting relationship and the amount of corneal toricity was found to significantly affect the amount of contact lens flexure.
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