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Investigative Ophthalmology & Visual Science, Vol 29, 795-801, Copyright © 1988 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

The black hole effect in perimetry

JM Britt and RP Mills
Department of Ophthalmology, University of Washington School of Medicine, Seattle 98195.

Light-emitting diodes (LEDs), mounted in drilled holes in the perimeter bowl, are used as stimuli in several automated perimeters. A concern is that these "black holes" might interrupt the otherwise uniform background illumination and cause inconsistent test results. A Dicon perimeter was modified by covering some of the LEDs with diffusing plastic. One eye of 41 normal volunteers was tested repetitively within the central 5 degrees of the visual field at the same 12 locations with both covered and uncovered LED stimuli. Higher variances of multiple threshold determinations were observed, significant at the 0.0005 level, when testing was done with uncovered LEDs. On average, the black hole effect contributed 0.8 dB to short-term fluctuation. The black hole effect is probably of minor clinical importance except in exacting quantitative perimetry.




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Copyright © 1988 by the Association for Research in Vision and Ophthalmology