ROD SENSITIVITY RELATIVE TO CONE SENSITIVITY IN RETINITIS PIGMENTOSA

  • 1 January 1979
    • journal article
    • research article
    • Vol. 18  (3) , 263-272
Abstract
Rod sensitivity relative to cone sensitivity is evaluated in retinitis pigmentosa patients. From perimetric measures of absolute thresholds to long- and short-wavelength stimuli, the results can be characterized in 3 different ways. For 1 group of patients it appears that only cone function is present in all parts of the visual field. For another group of patients, despite large losses in absolute sensitivity, rod sensitivity still exceeds cone sensitivity by at least the normal factor, suggesting concomitant rod and cone sensitivity losses. For a 3rd group of patients it appears that central retinal thresholds are determined primarily by cones, midperipheral retinal thresholds determined by a composite of rod and cone function, and far-peripheral thresholds determined predominantely by rods. The different groups of threshold results probably represent different disease mechanisms rather than different stages in the progression of a single disease process.

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