Calculation of AC/A ratio| Heterophoria Method| Gradient Method| Clinical Measuring of AC/A ratio

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Clinical measurement of AC/A ratio
What does it mean by 4:1?
Definition: The measurement of the convergence induced by accommodation per diopter of accommodation.
Normal: 4:1
Purpose:To determine the change in accommodative convergence that occurs when the patient accommodate or relaxes accommodate by a given amount.
Methods of measurement of AC/A Ratio: 1. Heterophoria methods 2. Gradient methods

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