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

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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

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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