Steepening the GP lens base curve has what effect on sagittal depth (sag)?

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Study for the Gas Permeable Contact Lenses Test. Utilize flashcards and multiple-choice questions with hints and explanations. Prepare thoroughly for your test!

Multiple Choice

Steepening the GP lens base curve has what effect on sagittal depth (sag)?

Explanation:
Steepening the base curve reduces the radius of curvature, making the posterior surface more curved. For a given lens diameter, a tighter curvature increases the sag depth because the vertical height of the lens profile relative to the corneal plane grows as the radius gets smaller (sag ≈ D^2/(8R)). So when the base curve is steeper, the sagittal depth increases.

Steepening the base curve reduces the radius of curvature, making the posterior surface more curved. For a given lens diameter, a tighter curvature increases the sag depth because the vertical height of the lens profile relative to the corneal plane grows as the radius gets smaller (sag ≈ D^2/(8R)). So when the base curve is steeper, the sagittal depth increases.

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