Triple-Function Ocular Monitor

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Abstract
An optical monitor is described which records simultaneously and dynamically lens deformation, pupil diameter, and accommodative vergence in human subjects in response to accommodative stimulation. The stimulus is in the form of an illuminated target moving on the optical axis of one eye. The lens, pupil, and vergence responses are recorded by using infrared-sensitive photodiodes and photomultipliers. The responses are measured and recorded in real time and also are averaged by computer to give ensemble-average responses. The monitor system has a bandwidth to 30 Hz on all channels. System sensitivities are 0.15 diopters, 0.01 mm, and 0.1 deg for lens, pupil diameter, and vergence measurements, respectively. The stimulus dynamic range is 0 to 10 diopters of target position. Computer averages of step responses show marked asymmetrical characteristics of the ocular system.

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