Which feature is associated with a flat GP lens fit?

• A. Adequate edge clearance
• B. Well centered with adequate movement
• C. Central alignment
• D. Central touch

Answer: (D)

A flat GP lens fit means the lens curvature is flatter than the corneal curvature. When the posterior surface is flatter, the lens vaults less over the central cornea, so the center of the lens is more likely to sit in contact with the corneal surface. In other words, central bearing or contact (central touch) tends to occur with a flat fit, while the edges can have clearance because the peripheral portion sits higher relative to the cornea. This central contact is the feature most associated with a flat fit.

The other features describe fits that are typically neutral or better centered, with appropriate edge behavior or movement, rather than the central bearing pattern that flat fits tend to produce.