APA Dictionary of Psychology

a disorder of the retina marked by progressive atrophy of the photoreceptors (affecting rods more than cones) and disturbances in the retinal pigment epithelium. Retinitis pigmentosa causes night blindness and visual field loss (see tunnel vision). Although most commonly a hereditary condition, it has been associated with the use of phenothiazine antipsychotics, such as chlorpromazine and especially thioridazine.