Open Collections

A study of sensitivity gradients and spatial summation in the normal retina by static chromatic perimetry with photometrically-equated stimuli under fully-photopic and fully-scotopic conditions

University of British Columbia

A study was conducted to investigate the sensitivity and spatial summation properties of the normal retina under fully-photopic and fully-scotopic conditions, using photometrically-equated chromatic stimuli of four sizes. Fully-photopic adaptation yielded equivalent sensitivity gradients extra-foveally but different foveal thresholds for the red, green and blue stimuli. The extra-foveal scotopic sensitivity gradients were similar in form but different in height for the chromatic stimuli, while all stimuli excepting the smaller red ones yielded "relative scotomata" at the fovea. Spatial summation was shown to increase with eccentricity and decrease with increasing stimulus size under fully-photopic but not under fully-scotopic conditions, but was found in general to be greater under scotopic adaptation.

Text

2010-03-06

For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.

http://hdl.handle.net/2429/21597

Psychology

University of British Columbia

Graduate