Wikipedia
Retinitis pigmentosa (RP) is an inherited, degenerative eye disease that causes severe vision impairment due to the progressive degeneration of the rod photoreceptor cells in the retina. This form of retinal dystrophy manifests initial symptoms independent of age; thus, RP diagnosis occurs anywhere from early infancy to late adulthood. Patients in the early stages of RP first notice compromised peripheral and dim light vision due to the decline of the rod photoreceptors. The progressive rod degeneration is later followed by abnormalities in the adjacent retinal pigment epithelium (RPE) and the deterioration of cone photoreceptor cells. As peripheral vision becomes increasingly compromised, patients experience progressive "tunnel vision" and eventual blindness. Affected individuals may additionally experience defective light-dark adaptations, nyctalopia (night blindness), and the accumulation of bone spicules in the fundus.
Usage examples of "retinitis pigmentosa".
It was more usual for retinitis pigmentosa, said Mandarax, son of Gokubi, to let its hosts and hostesses see the world clearly for as long as thirty years sometimes.
Over the last few months she'd started to believe that, while the retinitis pigmentosa had robbed her of any semblance of night sight, sound and smell were beginning to compensate.
Not when retinitis pigmentosa had forced her to quit a job she'd both loved and excelled at.
The retinitis pigmentosa that had forced her from the Metro Police and denied her the night had been reversed when Henry'd changed her.
Cerebral palsy -- a spastic -- with a heart defect, and retinitis pigmentosa.
Cerebral palsy--a spastic--with a heart defect, and retinitis pigmentosa.