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 2-3 inches. For a young adult, it is 4-6 inches. The focus range for a 45-year-old adult is about 20 inches. For an 80-year-old adult, it is 60 inches. [1].

See also

• Convergence insufficiency
• Eye examination
• Negative relative accommodation
• Positive relative accommodation
• Presbyopia

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It uses material from the http://en.wikipedia.org/wiki/Amplitude+of+accommodation Wikipedia article Amplitude of accommodation.