Pupillometer for clinical applications using dual 256-element linear CCD arrays.
A new pupillometer for measuring the size of the pupil of the human eye is described. It uses two inexpensive 256-element charge coupled device (CCD) arrays in an orthogonal configuration. The system is controlled and data are analysed by means of a Z80A microcomputer. Software allows the position and diameter of the pupil to be displayed on a monochrome video monitor. Infra-red diodes irradiate the eye so that measurements can be made in darkness. The accuracy is better than +/- 0.1 mm, over the range 3.2-9.5 mm. Dynamic measurements of the pupil light reflex response can be made with sampling periods as short as 20 ms.
Jones
D P
DP
Department of Medical Electronics, St Bartholomew's Hospital Medical College, London, UK.
Harris
S J
SJ
Scicinski
S R
SR
D004582:Electronics, Medical; D006801:Humans; D007259:Infrared Rays; D008838:Microcomputers; D011680:Pupil; D012025:Reflex, Pupillary