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Are albino rats night blind?
D G Green1, P Herreros de Tejada, M J Glover
1Department of Ophthalmology, University of Michigan, Ann Arbor 48104-1687.
Investigative Ophthalmology & Visual Science
|July 1, 1991
Summary
Albino rats do not exhibit higher dark-adapted thresholds compared to pigmented rats, contrary to previous reports. Electroretinograms and pupillary light reflex tests did not confirm night blindness in albino rats.
Area of Science:
- Neuroscience
- Ophthalmology
- Animal Models
Background:
- Previous research suggested albino rats have significantly higher dark-adapted thresholds than pigmented rats, indicating potential night blindness.
- This finding was based on single-unit recordings from the superior colliculus and optic nerve.
Purpose of the Study:
- To verify the reported higher dark-adapted thresholds in albino rats compared to pigmented rats.
- To investigate the presence of night blindness in albino rats using electrophysiological and behavioral methods.
Main Methods:
- Electroretinograms (ERG) were recorded from albino (CD) and pigmented (Long-Evans hooded) rats.
- Pupillary light reflex thresholds were measured in the same rat strains.
- Dark-adapted thresholds were assessed using both ERG and pupillary light reflex measurements.
Main Results:
- Neither ERG nor pupillary light reflex measurements indicated higher dark-adapted thresholds in albino rats relative to pigmented rats.
- Both albino and pigmented rats exhibited dark-adapted thresholds similar to those previously reported for pigmented rats.
- The findings do not support the previous report of night blindness in albino rats.
Conclusions:
- The current study's findings do not verify the previous report of night blindness in albino rats.
- Electroretinograms and pupillary light reflex thresholds suggest comparable dark-adapted vision between albino and pigmented rats.
- Further research may be needed to understand visual differences between rat strains.