retinitis pigmentosa

Retinitis pigmentosa (RP) is an inherited, degenerative Human eye|eye disease that causes severe vision impairment and often blindness. Generally, the later the onset, the more rapid is the deterioration in sight. Also notice that people who do not have RP have 90 degree peripheral vision, while some people that have RP have less than 90 degree. A form of retinal Retinopathy|dystrophy, RP is caused by abnormalities of the photoreceptor cell|photoreceptors (rod cell|rods and cone cell|cones) or the retinal pigment epithelium (RPE) of the retina leading to progressive sight loss. Affected individuals may experience defective light to dark, dark to light adaptation or nyctalopia (night blindness), as the result of the degeneration of the peripheral vision|peripheral visual field (known as tunnel vision). Sometimes, central vision is lost first causing the person to look sidelong at objects. The effect of RP is best illustrated by comparison to a television or computer screen. The pixels...