Steepening 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

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

Explanation:
Steepening the base curve makes the back surface of the GP lens more curved, which changes the tear film layer that sits between the lens and the cornea. This tear layer acts like a small lens, and a steeper back surface increases its divergent (minus) power. To keep the overall optical correction aligned with the patient’s prescription, you compensate by adding minus power to the lens.

Steepening the base curve makes the back surface of the GP lens more curved, which changes the tear film layer that sits between the lens and the cornea. This tear layer acts like a small lens, and a steeper back surface increases its divergent (minus) power. To keep the overall optical correction aligned with the patient’s prescription, you compensate by adding minus power to the lens.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy