Retinitis pigmentosa (RP) is a group of inherited disorders in which abnormalities of the photoreceptors (rods and cones) or the retinal pigment epithelium (RPE) of the retina lead to progressive visual loss. Stakeholders first experience defective dark adaptation or "night blindness," followed by a narrowing of the peripheral visual field and possibly a loss of central vision late in the course of the disease.
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