To neutralize an exophoria on the cover test, which prism base direction is used?

Get ready for the NBEO Binocular Vision Test. Study with comprehensive materials and multiple-choice questions. Enhance your exam readiness with detailed explanations and practice questions to improve understanding and performance.

Multiple Choice

To neutralize an exophoria on the cover test, which prism base direction is used?

Explanation:
Exophoria is a tendency for the eyes to drift outward when fusion is disrupted. To neutralize this on the cover test, you want a prismatic effect that makes the eyes converge a bit. A base-in prism does exactly that: its light is bent toward the nose, producing a converging effect that counteracts the outward drift and helps the patient maintain single binocular vision. Using a base-out prism would push the eyes further apart, which won’t neutralize the exophoria, and base-up or base-down prisms address vertical misalignments, not horizontal exophoria.

Exophoria is a tendency for the eyes to drift outward when fusion is disrupted. To neutralize this on the cover test, you want a prismatic effect that makes the eyes converge a bit. A base-in prism does exactly that: its light is bent toward the nose, producing a converging effect that counteracts the outward drift and helps the patient maintain single binocular vision. Using a base-out prism would push the eyes further apart, which won’t neutralize the exophoria, and base-up or base-down prisms address vertical misalignments, not horizontal exophoria.

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