If the lens power is +4.00 and the optical center is displaced by 5mm what is the prismatic effect?

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Multiple Choice

If the lens power is +4.00 and the optical center is displaced by 5mm what is the prismatic effect?

Explanation:
Prentice's rule explains how decentering the optical center of a lens creates a prismatic effect. The prism diopters produced equal the lens power in diopters multiplied by the horizontal decentration in centimeters. Here, 5 mm of decentration is 0.5 cm, and the lens power is +4.00 D. So the induced prism is 4.00 × 0.5 = 2.0 prism diopters. The direction of the prism depends on the direction of the decentration, but the magnitude is 2.0D.

Prentice's rule explains how decentering the optical center of a lens creates a prismatic effect. The prism diopters produced equal the lens power in diopters multiplied by the horizontal decentration in centimeters. Here, 5 mm of decentration is 0.5 cm, and the lens power is +4.00 D. So the induced prism is 4.00 × 0.5 = 2.0 prism diopters. The direction of the prism depends on the direction of the decentration, but the magnitude is 2.0D.

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