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Vision Res. 2005 Jan;45(1):17-28.

Acceleration characteristics of human ocular accommodation.

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Vision Science Group, School of Optometry, University of California at Berkeley, 512 Minor Hall, Berkeley, CA 94720-2020, USA.


Position and velocity of accommodation are known to increase with stimulus magnitude, however, little is known about acceleration properties. We investigated three acceleration properties: peak acceleration, time-to-peak acceleration and total duration of acceleration to step changes in defocus. Peak velocity and total duration of acceleration increased with response magnitude. Peak acceleration and time-to-peak acceleration remained independent of response magnitude. Independent first-order and second-order dynamic components of accommodation demonstrate that neural control of accommodation has an initial open-loop component that is independent of response magnitude and a closed-loop component that increases with response magnitude.

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