If the near point distance is 0.25 meters, what is the near dioptric demand?

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 the near point distance is 0.25 meters, what is the near dioptric demand?

Explanation:
Near dioptric demand is the accommodative demand needed to focus at a given near distance, found by taking the reciprocal of the distance in meters. For a near point distance of 0.25 meters, the demand is 1 / 0.25 = 4 diopters. This means about 4 diopters of accommodation are required to see clearly at 25 cm. (0.5 m would need 2 D, 0.33 m about 3 D, and 1 m about 1 D.)

Near dioptric demand is the accommodative demand needed to focus at a given near distance, found by taking the reciprocal of the distance in meters. For a near point distance of 0.25 meters, the demand is 1 / 0.25 = 4 diopters. This means about 4 diopters of accommodation are required to see clearly at 25 cm. (0.5 m would need 2 D, 0.33 m about 3 D, and 1 m about 1 D.)

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