Two prism diopters correspond to which degree of visual field?

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Prepare for the NBEO Physiological Optics Test with flashcards and multiple choice questions, each offering hints and explanations. Equip yourself for your exam!

Multiple Choice

Two prism diopters correspond to which degree of visual field?

Explanation:
Prism diopters measure how much a prism bends light, which corresponds to an angular shift of the eye’s line of sight. For small angles, 1 prism diopter deflects by about 0.57 degrees. Therefore, 2 prism diopters produce roughly 1.14 degrees of shift, which rounds to about 1 degree. In other words, two prism diopters correspond to approximately one degree of visual field.

Prism diopters measure how much a prism bends light, which corresponds to an angular shift of the eye’s line of sight. For small angles, 1 prism diopter deflects by about 0.57 degrees. Therefore, 2 prism diopters produce roughly 1.14 degrees of shift, which rounds to about 1 degree. In other words, two prism diopters correspond to approximately one degree of visual field.

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