Flattening the base curve of a GP contact lens requires adding which type of power to compensate?

Study for the NBEO Physiological Optics Test. Prepare with flashcards and multiple-choice questions, each question has hints and explanations. Ace your exam!

Multiple Choice

Flattening the base curve of a GP contact lens requires adding which type of power to compensate?

Explanation:
Flattening the base curve changes the back surface of the GP lens to a less steep shape, which reduces the lens’s negative (minus) power. That shifts the focal point forward, producing a hyperopic effect. To restore the intended overall correction, you add plus power to the lens. A minus power would worsen the divergence, and zero power would not offset the change.

Flattening the base curve changes the back surface of the GP lens to a less steep shape, which reduces the lens’s negative (minus) power. That shifts the focal point forward, producing a hyperopic effect. To restore the intended overall correction, you add plus power to the lens. A minus power would worsen the divergence, and zero power would not offset the change.

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