For a flat GP lens, how should sagittal height 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

For a flat GP lens, how should sagittal height be adjusted?

Explanation:
Sagittal height determines how much vault the lens has above the cornea. A flat GP lens sits closer to the cornea and has less sagittal height, which can lead to bearing and inadequate tear reservoir. To achieve proper clearance with a flat lens, you need more sagittal height. This is accomplished by selecting a design with a steeper back surface (smaller base curve radius) or otherwise increasing the sagittal depth, which lifts the lens away from the central cornea. Increasing sagittal height improves tear film clearance, reduces apical bearing, and promotes better centration and comfort.

Sagittal height determines how much vault the lens has above the cornea. A flat GP lens sits closer to the cornea and has less sagittal height, which can lead to bearing and inadequate tear reservoir. To achieve proper clearance with a flat lens, you need more sagittal height. This is accomplished by selecting a design with a steeper back surface (smaller base curve radius) or otherwise increasing the sagittal depth, which lifts the lens away from the central cornea. Increasing sagittal height improves tear film clearance, reduces apical bearing, and promotes better centration and comfort.

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