title: Study of the effect of involuntary user movement on the potential light hazards from some ophthalmic instruments.
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.
authors.affiliation: Center for Devices and Radiological Health, Food and Drug Administration, 9200 Corporate Boulevard, Rockville, Maryland 20850, USA. rjl@cdrh.fda.gov
authors.forename: Robert
authors.initials: R
authors.lastname: Landry
authors.forename: Michael
authors.initials: M
authors.lastname: Wolffe
authors.forename: Clive
authors.initials: C
authors.lastname: Burrows
authors.forename: Bernhard
authors.initials: B
authors.lastname: Rassow
authors.forename: Gordon
authors.initials: G
authors.lastname: Byrnes
mesh_terms: D003941:Diagnostic Techniques, Ophthalmological / Q000009:adverse effects* / Q000295:instrumentation*; D005123:Eye / Q000528:radiation effects*; D005336:Fiber Optic Technology; D006282:Health Personnel; D006801:Humans; D008027:Light / Q000009:adverse effects*; D009038:Motion; D009068:Movement; D019721:Ophthalmoscopes / Q000009:adverse effects*; D055100:Optical Fibers; D014836:Volition