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Statements

Subject Item
dbr:Amplitude_of_accommodation
rdf:type
dbo:Disease
rdfs:label
Amplitude of accommodation
rdfs:comment
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 focussed as possible. 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.
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dbc:Ophthalmology
dbo:wikiPageID
3512602
dbo:wikiPageRevisionID
1068390547
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dbr:Positive_relative_accommodation dbr:Optical_power dbr:Eye dbr:Negative_relative_accommodation dbc:Ophthalmology dbr:Convergence_insufficiency dbr:Diopters dbr:Eye_examination dbr:Presbyopia
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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 focussed as possible. 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. 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 which, although widely cited, used methodology with considerable inherent error. (Donders, Sheard, Duane, Turner for reference)
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dbr:Increase
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