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Changes in visual sensitivity with age in rats with heredity retinal degeneration
1Department of Psychology, University of California, San Diego, La Jolla 92093.
Vision Research
|January 1, 1987
Summary
Royal College of Surgeons (RCS) rats exhibit progressive vision loss, contrary to previous behavioral studies. Our research reveals significant differences in light sensitivity thresholds between RCS and control rats as they age.
Area of Science:
- Ophthalmology
- Neuroscience
- Genetics
Background:
- Hereditary retinal degeneration in Royal College of Surgeons (RCS) rats causes photoreceptor loss.
- This degeneration impacts electroretinogram, ganglion cell sensitivity, and pupillary light reflex.
- Previous studies reported comparable behavioral thresholds between RCS rats and controls.
Purpose of the Study:
- To investigate behavioral visual thresholds in RCS rats compared to age-matched controls.
- To determine if behavioral measurements align with known physiological deficits in RCS rats.
Main Methods:
- Behavioral visual threshold measurements were conducted on RCS rats and control rats.
- Measurements were performed across a range of ages, specifically between four and twelve months.
- Data analysis focused on quantifying differences in light sensitivity.
Main Results:
- Behavioral measurements revealed significant differences in visual thresholds between RCS and control rats.
- Threshold differences were evident from four months of age, measuring approximately three log units.
- This difference progressively increased, reaching over seven log units by twelve months of age.
Conclusions:
- Behavioral visual thresholds in RCS rats are significantly impaired compared to controls.
- Our findings contradict previous reports suggesting comparable behavioral performance.
- Age-related progression of visual deficits is clearly demonstrated through behavioral testing in RCS rats.