The amplitude of accommodation is the maximum potential increase in optical power that an eye can achieve in adjusting its focus. It refers to a certain range of object distances for which the retinal image is as sharply focused as possible.
 | It has been suggested that this article be merged into Accommodation (vertebrate eye)#Human eyes. (Discuss) Proposed since July 2024. |
Amplitude of accommodation is measured during routine eye-examination. The closest that a normal eye can focus is typically about 10 cm for a child or young adult. Accommodation then decreases gradually with age, effectively finishing just after age fifty.[1][2][3]
The average amplitude of accommodation, in diopters, for a patient of a given age was estimated by Hofstetter in 1950 to be 18.5 − (0.30 * patient age in years) with the minimum amplitude of accommodation as 15 − (0.25 * age in years), and the maximum as 25 − (0.40 * age in years). However, Hofstetter's work was based on data from two early surveys[4][5] which, although widely cited, used methodology with considerable inherent error. (Donders, Sheard, Duane, Turner for reference)
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