BINOCULAR INFRARED OPTOMETER FOR MEASURING ACCOMMODATION IN BOTH EYESSIMULTANEOUSLY IN NATURAL-VIEWING CONDITIONS

A binocular IR optometer has been developed to measure accommodation c ontinuously and simultaneously in both human eyes in conditions close to natural viewing where a subject gazes at an actual target with bino cular vision. Measurement accuracy is approximately 0.24 D with a prec ision of 0.05 D within a refractive-power range of +10 to -10 D in mod el eyes. The dynamic response is over 100 D/s. In addition we measured simultaneously and continuously accommodation, pupil diameter, and ey e position of both human eyes in near-reflex conditons using this bino cular optometer. Development of the tracking IR binocular optometer is discussed in detail.