The ideal edge thickness to promote lid attachment is the edge thickness of a ________D GP lens.

The ideal edge thickness to promote lid attachment is the edge thickness of a ________D GP lens.

• A. -3.50D
• B. -3.00D
• C. -2.50D
• D. -4.00D

Answer: (B)

The ability of the eyelid to attach and stabilize a GP lens depends on the edge thickness where the lid meets the lens edge. A moderate edge thickness provides enough lid contact to create a stable seal without causing irritation or undue friction during blinking. In practice, the edge thickness that best promotes lid attachment corresponds to the edge profile of a -3.00 D GP lens. If the edge were thinner (like a -2.50 D lens), it might not engage the lid sufficiently, reducing lid attachment. If the edge were thicker (as with -3.50 or -4.00 D lenses), it could press more on the lid margin or rub, causing discomfort or interference with lid movement. Thus, -3.00 D is the most favorable balance for lid attachment.

The ability of the eyelid to attach and stabilize a GP lens depends on the edge thickness where the lid meets the lens edge. A moderate edge thickness provides enough lid contact to create a stable seal without causing irritation or undue friction during blinking. In practice, the edge thickness that best promotes lid attachment corresponds to the edge profile of a -3.00 D GP lens.

If the edge were thinner (like a -2.50 D lens), it might not engage the lid sufficiently, reducing lid attachment. If the edge were thicker (as with -3.50 or -4.00 D lenses), it could press more on the lid margin or rub, causing discomfort or interference with lid movement. Thus, -3.00 D is the most favorable balance for lid attachment.