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The influences of stimulus wavelength and eccentricity on short‐wavelength pathway isolation in automated perimetry
Author(s) -
Cubbidge R. P.,
Wild J. M.
Publication year - 2001
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1046/j.1475-1313.2001.00538.x
Subject(s) - optics , wavelength , stimulus (psychology) , luminance , chromaticity , physics , materials science , medicine , psychology , psychotherapist
Summary The aim of the study was to determine whether the suggested stimulus and background parameters employed in commercially available short‐wavelength sensitive perimetry (SWAP) are clinically appropriate. Threshold versus intensity curves were measured using a modified Humphrey Field Analyser. The reduction in background luminance was achieved using aperture stops in order to avoid changes in the chromaticity of the background. Short‐wavelength thresholds were determined for 440, 450 and 460 nm stimuli and were corrected for pre‐receptoral absorption. Short‐wavelength sensitive pathway isolation was approximately 1.5 log units and decreased with increases in eccentricity and in stimulus wavelength. It would seem that the use of a 450 nm narrowband stimulus filter would offer a compromise between both the physiological requirements and the physical properties of the stimulus. Such an approach would reduce some of the inherent between‐subject normal variability associated with SWAP.