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  • Title: Accommodation to stationary and moving targets.
    Author: Kruger PB, Aggarwala KR, Bean S, Mathews S.
    Journal: Optom Vis Sci; 1997 Jul; 74(7):505-10. PubMed ID: 9293518.
    Abstract:
    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.
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