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Published on: December 5, 2014
Accommodation to stationary and moving targets
P B Kruger1, K R Aggarwala, S Bean
1Schnurmacher Institute for Vision Research, State College of Optometry, State University of New York, New York, USA.
Purpose:
To test the hypothesis that the contrast of spectral components of the retinal image specifies ocular focus and controls reflex accommodation.
Methods:
Eight subjects viewed a stationary target at 0, 2.5, and 5 D in a Badal optometer, with longitudinal chromatic aberration (LCA) normal and reversed and in monochromatic (550 nm) light. Accommodation was monitored continuously during 40-s trials. Subjects also viewed the grating target as it moved sinusoidally (1.5 to 2.5 D) at 0.2 Hz under the same three conditions.
Results:
Subjects accommodated relatively accurately at all distances in the normal condition; three subjects had difficulty accommodating in monochromatic light at 5 or 0 D, and seven subjects could not maintain focus with LCA reversed. The accommodative response differed significantly in the three chromatic conditions both for stationary and moving targets.
Conclusions:
Relative contrast of long-, middle-, and short-wavelength components of the retinal image specifies ocular focus and drives reflex accommodation.
