If a patient has 3 degrees of visual field loss, approximately how many prism diopters would be prescribed?

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

If a patient has 3 degrees of visual field loss, approximately how many prism diopters would be prescribed?

Explanation:
The key idea is converting angular field loss into prism diopters. A prism diopter deflects light by about 0.57 degrees (since 1 pd shifts light by 1 cm at 1 m). So to offset roughly 3 degrees of field loss, you’d need roughly 3 / 0.57 ≈ 5.3 prism diopters. The closest practical value is 6 prism diopters, making that the best approximate prescription.

The key idea is converting angular field loss into prism diopters. A prism diopter deflects light by about 0.57 degrees (since 1 pd shifts light by 1 cm at 1 m). So to offset roughly 3 degrees of field loss, you’d need roughly 3 / 0.57 ≈ 5.3 prism diopters. The closest practical value is 6 prism diopters, making that the best approximate prescription.

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