Gas Permeable Contact Lenses Practice Test 2026 – Complete Exam Prep

Rigid gas-permeable lenses change the way the lids interact with the eye because they hold their shape on the cornea and present a defined edge that the lids must clear with each blink. This lid–lens contact and the edge’s position tend to increase lid tension and cause the eyelids to close more snugly around the lens during blinking. That mechanical coupling reduces the vertical space between the upper and lower lids, so the palpebral aperture appears smaller when the lens is worn. While some individuals may notice little change or more variability, the typical effect of GP lenses is a smaller palpebral fissure.