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THE EFFECT OF ILLUMINATION AND FOVEAL FUSION LOCK ON CLINICAL FIXATION DISPARITY MEASUREMENTS WITH THE SHEEDY DISPAROMETER
Author(s) -
Wildsoet C. F.,
Cameron K. D.
Publication year - 1985
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 - 10.1111/j.1475-1313.1985.tb00653.x
Subject(s) - foveal , fusion , fixation (population genetics) , optometry , fovea centralis , computer science , lock (firearm) , ophthalmology , optics , medicine , physics , geography , retinal , archaeology , population , linguistics , philosophy , environmental health
— The Sheedy Disparometer is a clinical instrument designed to measure fixation disparity and hence determine forced vergence — fixation disparity curves. The target design includes a central 1.5° fusion‐free area. The effect of introducing a central fixation target to the instrument is investigated along with the influence of ambient illumination level on fixation disparity. All curve parameters, i.e. curve type, slope, X‐ and y‐intercepts were found to significantly alter with the introduction of a foveal lock. Illumination changes did not cause significant differences in any parameter.