The disease causes gradual blindness, which first affects vision in poor lighting conditions and eventually results in complete blindness months to years later. (northwestanimaleye.com)
The retina of the eye is especially at risk, with either sudden or gradual blindness often being the first sign of latent high blood pressure. (vin.com)
This disease causes gradual blindness to affected animals, while carriers are not affected. (breedingbusiness.com)