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Perceptual Visual Acuity Declines With Age in a Rat Model of Retinitis Pigmentosa While Light Perception is
Naofumi Suematsu1,2,3, Akinori Y Sato1,4, Akihiro Kimura1,5
1Graduate School of Medicine, Osaka University, Osaka, Japan.
Investigative Ophthalmology & Visual Science
|March 17, 2025
Summary
Form vision declines in retinitis pigmentosa (RP) rat models, while light perception remains intact due to intrinsically photosensitive retinal ganglion cells. This research aids in evaluating RP treatments.
Area of Science:
- Ophthalmology
- Neuroscience
- Genetics
Background:
- Retinitis pigmentosa (RP) is a leading genetic cause of blindness, affecting retinal epithelium and photoreceptors.
- Understanding visual decline in RP is critical for disease staging and treatment evaluation.
Purpose of the Study:
- Investigate visual response and ability decline during retinitis pigmentosa (RP) progression.
- Establish methods for disease staging and evaluating interventional treatments for RP.
Main Methods:
- Utilized Royal College of Surgeons (RCS) rats, a model for inherited RP.
- Assessed form visual acuity and light perception via behavioral tests and electrophysiological recordings in key visual brain areas.
Main Results:
- Form vision, detected by grating stimuli, attenuated by 9 weeks.
- Neural responses mirrored behavioral decline in visual areas.
- Light perception and associated neural responses remained preserved until at least 11 weeks.
Conclusions:
- Form vision is significantly impacted by RP progression.
- Non-form vision, particularly light perception, shows resilience due to intrinsically photosensitive retinal ganglion cells.
- Findings offer fundamental insights for assessing experimental RP therapies.
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