A solid-state instrument for measuring dynamic changes in the pupil of the human eye.
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 system. 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.
D001698:Biomedical Engineering / Q000295:instrumentation*; D006801:Humans; D007259:Infrared Rays; D008838:Microcomputers; D011680:Pupil / Q000502:physiology*