The effect of refractive correction on automated perimetric thresholds |
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| Authors: | R N Weinreb J P Perlman |
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| Affiliation: | 1. Department of Ophthalmology, Hanyang University Seoul Hospital, Seoul, South Korea;2. Department of Ophthalmology, Hanyang University College of Medicine, Seoul, South Korea;3. Department of Ophthalmology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, South Korea;4. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, South Korea;5. Department of Ophthalmology, Seoul National University Hospital, Seoul, South Korea;1. Smith-Kettlewell Eye Research Institute, 2318 Fillmore St., San Francisco, CA 94115, United States;2. Envision, Inc., 610 N. Main St., Wichita, KS 67203, United States;3. Tobii Technology AB, Karlsrovägen 2D, 182 53 Danderyd, Sweden;1. Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St Louis, Missouri, USA;2. Office of Inclusion & Diversity, Perelman School of Medicine, Philadelphia, Pennsylvania, USA;3. The Eye Institute, Medical College of Wisconsin, Milwaukee, Wisconsin, USA;4. Bascom Palmer Eye Institute, University of Miami School of Medicine, Miami, Florida, USA;5. Department of Ophthalmology Wilmer Institute and Department of International Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA;1. Transportation Safety Board of Canada, Ottawa, Ontario, Canada;2. Department of Psychology, University of Ottawa, Ottawa, Ontario, Canada;3. Systems Technology Incorporated, Hawthorne, CA, USA;1. Institute for Ophthalmic Research, Eberhard Karls University Tuebingen, Elfriede-Aulhorn-Straße 7, 72076 Tuebingen, Germany;2. Carl Zeiss Vision International GmbH, Turnstrasse 27, 73430 Aalen, Germany;3. University of Applied Sciences Aalen, Anton-Huber-Straße 23, 73430 Aalen, Germany;4. University Eye Hospital, Centre for Ophthalmology, Elfriede-Aulhorn-Straße 7, 72076 Tuebingen, Germany |
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| Abstract: | We determined the effect of introducing errors in refractive correction on the threshold retinal sensitivity in the central 6 degrees of the visual field in 11 normal subjects using automated static perimetry (Octopus program 62). A summated value of threshold retinal sensitivity was computed for each visual field by taking the sum of all 21 measured points in units of decibels. In 21 of 22 tested eyes, the emmetropic condition was associated with the highest summated retinal sensitivity. Summated retinal sensitivity decreased with increasing plus spherical (+1.00 and +2.00 diopters) power in 21 of 22 eyes. Threshold retinal sensitivity decreased -0.377 dB/degree for each degree away from fixation (P less than .0001). These slopes did not appear to depend on the refractive error (P = .77). Thus, even small refractive errors can artifactitiously decrease threshold retinal sensitivity within the central 6 degrees of the visual field. |
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