Amplitude of accommodation

Amplitude of accommodation

Amplitude of accommodation (AA) is a measurement of the eye’s ability to focus clearly on objects at near distances (i.e. accommodation). This eye focusing range for a child is usually about 5–7.5 cm (2–3 inches). For a young adult, it is 10–15 cm (4–6 inches). The focus range for a 45-year-old adult is about 50 cm (20 inches). For an 80-year-old adult, it is 1.5 m (60 inches). []

The average amplitude of accommodation, in diopters, for a patient of a given age may be estimated by Hofstetter's formula: 18.5 minus one third of the patient's age in years. [Scheiman, Mitchell and Wick, Bruce. "Clinical Management of Binocular Vision." Lippincott, New York. 1994.]

ee also

*Convergence insufficiency
*Eye examination
*Negative relative accommodation
*Positive relative accommodation


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