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Dynamic control of ocular disaccommodation: first and second-order dynamics.

Bharadwaj SR, Schor CM

School of Optometry, University of California at Berkeley, CA 94720, USA.

Velocity and acceleration characteristics provide valuable information about dynamic control of accommodation. We investigated velocity and acceleration of disaccommodation (near-far focusing) from three starting positions. Peak velocity and peak acceleration of disaccommodation increased with the proximity of starting position however for a given starting position they were invariant of response magnitude. These results suggest that all disaccommodation responses are initiated towards a constant primary destination and are switched mid-flight to attain the desired final position. Large discrepancies between the primary destination and desired final position appear to produce overshoots and oscillations of small responses from proximal starting positions.

Published 2 January 2006 in Vision Res, 46(6): 1019-37.
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