Abstract
An instrument for making dynamic measurements of the human pupil is described. The device uses a 100-element linear self-scanning photodiode array and a Z80A microprocessor systems. The eye is imaged using infrared radiation. The instrument has both analogue and digital outputs of pupil diameter, which are accurate to better than ± 2.5% of full scale. By compensating for the inherent nonuniformities in the photodiode array, the microcomputer maintains the accuracy and reliability of the system at low irradiance levels. A simple means of implementing a two-dimensional measuring system is proposed.
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