When a GP lens is steep, how should the OAD be adjusted?

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Prepare for the Gas Permeable Contact Lenses Test. Study with flashcards and practice multiple choice questions. Each question includes hints and explanations. Ace your exam!

Multiple Choice

When a GP lens is steep, how should the OAD be adjusted?

Explanation:
When a GP lens is steeper than the eye requires, its sagittal depth is too high, leading to tight fit and poor edge alignment. Reducing the overall diameter lowers the lens’s sagittal height, which helps the edge settle more naturally and improves centration and movement. Increasing the diameter would raise the sag and likely worsen the steep fit, while leaving it unchanged won’t correct the misfit. Reversing would alter the curvature, not the diameter, so the intended adjustment here is to use a smaller diameter.

When a GP lens is steeper than the eye requires, its sagittal depth is too high, leading to tight fit and poor edge alignment. Reducing the overall diameter lowers the lens’s sagittal height, which helps the edge settle more naturally and improves centration and movement. Increasing the diameter would raise the sag and likely worsen the steep fit, while leaving it unchanged won’t correct the misfit. Reversing would alter the curvature, not the diameter, so the intended adjustment here is to use a smaller diameter.

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