Which description is commonly associated with a flat GP lens fit?

• A. Excessive edge lift
• B. Very stable centration
• C. No edge lift
• D. Adequate edge clearance

Answer: (A)

When a gas-permeable lens is flatter than the eye’s curvature, it doesn’t wrap snugly around the peripheral cornea and sclera. The lens edge ends up sitting higher than ideal, causing the edge to lift away from the ocular surface. This excessive edge lift is a classic sign of a flat GP lens fit.

Think of it this way: the center can still sit over the cornea, but the periphery doesn’t follow the eye’s contour closely enough, so the edge loosens and rises. In contrast, a well-fitting lens tends to show stable centration with no edge lift, and a lens that’s too steep often shows edge compression rather than lift. So the description that best matches a flat fit is the edge lifting away at the periphery.