How do ocular aids impact retinal risk when viewing divergent sources? We present ray tracing calculations for ocular aids used in several common configurations and compare risk relative to an unaided eye. Retinal irradiance values for sources of different subtence and divergence were calculated for ocular aids of different magnifying power. The data show the stark difference between point sources, like lasers, and extended sources, such as LEDs and lamps. Arguing from fundamental physiological phenomena we compare the relative ocular risks of various sources under a range of viewing conditions and compare these calculations with standards proposed to classify such different sources. We conclude that, if point sources are correctly classified, then extended sources, such as LEDs, are overclassified by the IEC 825-1/CENELEC.
Skip Nav Destination
ILSC '97: Proceedings of the International Laser Safety Conference
March 17–20, 1997
Orlando, Florida, USA
ISBN:
978-0-912035-13-0
PROCEEDINGS PAPER
Ray tracing of optical aids: Implications for ocular risk
Jean M. Trewhella
Jean M. Trewhella
2, (914) 945-2786
3
IBM T.J. Watson Research Center
, P.O. Box 218, Yorktown Heights, NY. 10598, USA
Search for other works by this author on:
Published Online:
March 01 1997
Citation
Mark B. Ritter, Jean M. Trewhella; March 17–20, 1997. "Ray tracing of optical aids: Implications for ocular risk." Proceedings of the ILSC '97: Proceedings of the International Laser Safety Conference. ILSC '97: Proceedings of the International Laser Safety Conference. Orlando, Florida, USA. (pp. pp. 531-539). ASME. https://doi.org/10.2351/1.5056447
Download citation file:
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.