What are the Morgan's norms for Near BI smooth vergences?

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

What are the Morgan's norms for Near BI smooth vergences?

Explanation:
Morgan's norms give typical ranges for smooth vergences at near, used to judge binocular function. For near base-in smooth vergences, the expected values show how much base-in prism you can apply before breaking fusion, how much you need to recover single vision after breaking, and the amount you can sustain in that near-range. The standard set is 13/21/13 prism diopters, meaning a break at about 13 PD BI, a recovery at about 21 PD BI, and a similar near-range reserve of about 13 PD. This is why 13/21/13 is the best answer—it matches the established near BI smooth vergence norms.

Morgan's norms give typical ranges for smooth vergences at near, used to judge binocular function. For near base-in smooth vergences, the expected values show how much base-in prism you can apply before breaking fusion, how much you need to recover single vision after breaking, and the amount you can sustain in that near-range. The standard set is 13/21/13 prism diopters, meaning a break at about 13 PD BI, a recovery at about 21 PD BI, and a similar near-range reserve of about 13 PD. This is why 13/21/13 is the best answer—it matches the established near BI smooth vergence norms.

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