Which statement best describes the purpose of dynamic stabilization in GP lenses?

• A. Thinner at the inferior and superior edges
• B. Thicker at the inferior and superior edges
• C. No change across the lens
• D. Only the central zone changes

Answer: (A)

Dynamic stabilization works by using the eyelids’ own movements to lock the rigid GP lens into a stable orientation. Making the inferior and superior edges thinner gives the edge a bit more flexibility under blink forces, so the lids can guide and hold the lens in a consistent position that aligns with the corneal astigmatic axis. This peripheral thinning reduces the tendency for the lens to rotate or decenter with blinking or eye movements, helping it settle into and stay in the correct orientation. If the edges were thicker, lid forces would have less influence, increasing the chance of instability. The central zone isn’t where this stabilization comes from—the edge behavior under lid dynamics is what maintains steady positioning.