Study of the effect of involuntary user movement on the potential light hazards
from some ophthalmic instruments

Robert Landry; Michael Wolffe; Clive Burrows; Bernhard Rassow; Gordon Byrnes

doi:10.1364/AO.43.001643

Applied Optics
Vol. 43,
Issue 8,
pp. 1643-1647
(2004)
•https://doi.org/10.1364/AO.43.001643

Study of the effect of involuntary user movement on the potential light hazards from some ophthalmic instruments

Robert Landry, Michael Wolffe, Clive Burrows, Bernhard Rassow, and Gordon Byrnes

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Robert Landry, Michael Wolffe, Clive Burrows, Bernhard Rassow, and Gordon Byrnes, "Study of the effect of involuntary user movement on the potential light hazards from some ophthalmic instruments," Appl. Opt. 43, 1643-1647 (2004)

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Abstract

A study was undertaken to determine whether involuntary user movement provides a basis for relaxing the measurement conditions for evaluating the potential optical radiation hazards to the eye from slit lamps and indirect ophthalmoscopes. This was accomplished by assessment of the extent to which light from these devices can be maintained in focus on a 1-mm-diameter fiber-optic cable for 45 s. The results suggest that, although involuntary user movements can be significant, they do not provide a basis for relaxing the measurement conditions for evaluating the potential optical radiation hazards to the cornea and lens from slit lamps and indirect ophthalmoscopes.

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Component and Mode of Use	Mean Ratio	Standard Deviation	Maximum Value	Minimum Value
Hand-held Topcon+14D lens	0.17	0.08	0.31	0.07
Hand-held Zeiss +20D lens	0.07	0.05	0.19	0.01
Hand-held Ocular+28D lens	0.27	0.18	0.54	0.03
Head-mounted indirect ophthalmoscope with fixed Zeiss+20D lens	0.25	0.20	0.61	0.00
Hand-held Volk 28D lens with head-mounted indirect ophthalmoscope	0.67	0.01	0.68	0.66
Hand-held Nikon 20D lens with head-mounted indirect ophthalmoscope	0.69	0.06	0.73	0.69

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Applied Optics