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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 30 (1992), S. 487-490 
    ISSN: 1741-0444
    Keywords: Charge-coupled device ; Infra-red ; Pupillometer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract 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.
    Type of Medium: Electronic Resource
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