When you observe a steep GP lens on the eye, which change to the optic zone diameter (OZD) is recommended?

• A. Smaller
• B. Larger
• C. Same
• D. Unknown

Answer: (A)

When a GP lens sits too steep on the eye, it tends to bear more in the central area and sit tightly with limited movement. The optic zone diameter defines how much of the cornea is covered by the lens in the center. Making the optic zone diameter smaller reduces the central contact area and the overall sagittal height of the lens on the eye. This helps the lens seat more evenly, improves centration, and eases the tight fit without changing the lens material or back curve. So, reducing the optic zone diameter is the appropriate adjustment for a steep GP lens. Larger or unchanged diameters would not alleviate the tight central bearing, and “unknown” isn’t a corrective step.