Optometry and vision science : official publication of the American Academy of Optometry
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The three-dimensional optometer (TDO III) was used to measure accommodative responses when gazing at a spotlight that changed its diameter in an otherwise completely dark room. Three emmetropic females served as subjects and the stimuli were presented at 33 cm (-3 D) from the subjects. ⋯ This means that the eye accommodated less, although the spotlight was felt to be nearer, and contradicts the common belief based on the subjectively measured data reported earlier. By conducting several supplemental experiments, we infer that this phenomenon comes from the effort in reducing accommodation lag dynamically in order to see the smaller target more clearly.