Laser retinal thermal damage threshold: impact of small-scale ocular motion

Brian Jason Lund

doi:10.1117/1.2393091

1 November 2006 Laser retinal thermal damage threshold: impact of small-scale ocular motion

Brian Jason Lund

Author Affiliations +

Journal of Biomedical Optics, Vol. 11, Issue 6, 064033 (November 2006). https://doi.org/10.1117/1.2393091

Abstract

The impact of the small-scale ocular motion that occurs during steady gaze on the retinal thermal damage threshold for long-duration laser exposures is investigated. Exposure durations from 100 msec to 50 sec are considered. Experimentally recorded eye movement data are input into a numerical simulation to calculate the increase in temperature experienced by the retina during an exposure to a continuous wave laser. Calculations are for a small retinal beam spot. An Arrhenius damage integral is used to estimate the thermal damage threshold. The impact of the ocular movements is expressed as a relief factor χ, defined as the ratio of the theoretical damage threshold in the presence of ocular motion to the threshold calculated assuming no eye motion. The relief factor is found to be 1.05 for a 100-msec exposure, increasing to 1.3 for a 50-sec exposure. The relief factor is described well by the equation χ=1.12 Τ^0.037 for exposure durations Τ in the range 100 msec to 50 sec.

©(2006) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Brian Jason Lund "Laser retinal thermal damage threshold: impact of small-scale ocular motion," Journal of Biomedical Optics 11(6), 064033 (1 November 2006). https://doi.org/10.1117/1.2393091

Published: 1 November 2006

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KEYWORDS

Eye

Laser damage threshold

Retina

Eye models

Helium neon lasers

Laser induced damage

Motion estimation

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