Contribution of eye movements to thermal damage thresholds for long-duration laser exposures

Brian Jason Lund

doi:10.1117/12.598207

18 April 2005 Contribution of eye movements to thermal damage thresholds for long-duration laser exposures

Brian Jason Lund

Author Affiliations +

Proceedings Volume 5688, Ophthalmic Technologies XV; (2005) https://doi.org/10.1117/12.598207
Event: SPIE BiOS, 2005, San Jose, CA, United States

Abstract

In an awake and alert individual, intrinsic eye movements will cause a laser beam spot to move about an extended area of the retina during a long-duration exposure. A single point on the retina will be heated when directly exposed to the laser beam, but will cool when the beam spot is moved to another location. The thermal damage threshold is therefore expected to be larger than the value estimated in standard damage models, in which the eye is treated as a stationary receiver. Experimentally measured eye movement data, recorded during deliberate fixation, were input into a computer program to calculate the increase in temperature occurring in the retina during a long-duration exposure to a continuous wave laser. A simple Arrhenius damage integral model was used to estimate the thermal damage thresholds, which were then compared to the threshold estimated for a stationary eye. The eye movements are found to increase the damage threshold by 18% for 2 second exposures, and 38% for 50 second exposures.

Citation Download Citation

Brian Jason Lund "Contribution of eye movements to thermal damage thresholds for long-duration laser exposures", Proc. SPIE 5688, Ophthalmic Technologies XV, (18 April 2005); https://doi.org/10.1117/12.598207

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KEYWORDS

Eye

Laser damage threshold

Retina

Thermal modeling

Eye models

Continuous wave operation

Head

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