With a steep fitting lens, a plus/minus tear lens is created and we need to add plus/minus to compensate.

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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

With a steep fitting lens, a plus/minus tear lens is created and we need to add plus/minus to compensate.

Explanation:
When a gas-permeable lens sits steeper than the cornea, the tear film between lens and cornea forms a positive (plus) tear lens. That tear layer adds refractive power to the eye, making the overall optical effect more plus than intended. To achieve the target refractive correction, you compensate by reducing the lens power you prescribe—that is, you add minus power to the back surface or overall lens to offset the added plus from the tear lens. So a steep fitting lens creates a plus tear lens, and the proper compensation is to add minus. This is why the correct approach is plus tear lens with minus compensation.

When a gas-permeable lens sits steeper than the cornea, the tear film between lens and cornea forms a positive (plus) tear lens. That tear layer adds refractive power to the eye, making the overall optical effect more plus than intended. To achieve the target refractive correction, you compensate by reducing the lens power you prescribe—that is, you add minus power to the back surface or overall lens to offset the added plus from the tear lens. So a steep fitting lens creates a plus tear lens, and the proper compensation is to add minus. This is why the correct approach is plus tear lens with minus compensation.

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