Which description best describes a steep GP lens fit?

• A. Central pooling
• B. Central touch
• C. Central alignment
• D. Rocky movement

Answer: (D)

Movement of a GP lens on blinking shows how well the lens fits the cornea. A steep fit means the base curve is too curved for the eye, so the lens sits tighter and bears more centrally. That tighter seating makes the edge interact with the lid more aggressively, so with each blink the lens tends to ride or shift in a rough, uneven way rather than glide smoothly. The result is a “rocky” movement pattern—jerky, irregular motion rather than a clean, predictable slide.

This dynamic description is different from static central descriptions like central pooling (tears under the center), central touch (lens contacting the central cornea), or central alignment (even, centered contact). In a steep fit, the key observation is the unstable, rocking movement caused by the lid interacting with a lens that is too tight. To improve it, a flatter base curve (larger radius) is typically considered to reduce bearing and promote smoother movement.