A +2.50 OU prescription comes in from the lab with the PD too wide. What prismatic effect will this have on the patient's vision?

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Prepare for the Shopko Optician Certification Test. Study with flashcards and multiple choice questions. Enhance your knowledge with detailed explanations and get ready to excel in your exam!

Multiple Choice

A +2.50 OU prescription comes in from the lab with the PD too wide. What prismatic effect will this have on the patient's vision?

Explanation:
When the interpupillary distance (PD) in the glasses is too wide, the lenses are decentered away from the eyes. This horizontal decentration creates a horizontal prismatic effect equal to the amount of decentration times the lens power. Since the centers sit farther apart than the eyes, the eye’s image must be shifted outward to align with the optical center, producing a prism with the base toward the temple (outward). This is a horizontal prism effect, not vertical, so the prism direction is outward rather than up or down.

When the interpupillary distance (PD) in the glasses is too wide, the lenses are decentered away from the eyes. This horizontal decentration creates a horizontal prismatic effect equal to the amount of decentration times the lens power. Since the centers sit farther apart than the eyes, the eye’s image must be shifted outward to align with the optical center, producing a prism with the base toward the temple (outward). This is a horizontal prism effect, not vertical, so the prism direction is outward rather than up or down.

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