Accommodation to size and blur changing in counterphase.
We explored the influence of changing size and blur on accommodation by presenting the two stimuli sinusoidally in counterphase. The frequency response of the accommodative system (0.05 to 1 Hz) was determined using a high-speed infrared optometer while the subject viewed the target in a Badal optometer. Blur was provided by moving the target dioptrically toward and away from the subject, and size of the target was altered by a variable aperture. Both stimuli were varied sinusoidally at the same frequency, but in counterphase. We find that both size and blur can have an influence on accommodation: blur is particularly powerful at low temporal frequencies, whereas size becomes effective at moderate and high temporal frequencies.
Schnurmacher Institute for Vision Research, State College of Optometry, State University, New York, New York.
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PB
Kruger
J
J
Pola
D000065:Accommodation, Ocular; D000328:Adult; D006801:Humans; D014787:Vision Tests; D014785:Vision, Ocular / Q000502:physiology*; D014792:Visual Acuity