text: <unk>  <unk>  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,<unk>  diagnosis occurs anywhere from early infancy to late adulthood. Patients in the early stages of<unk>  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 <unk> E) 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.
option_0: Retinitis pigmentosa
option_1: Corneal dystrophy
option_2: Central serous retinopathy
option_3: Diabetic retinopathy
option_4: Vitelliform macular dystrophy
option_5: Purtscher's retinopathy
option_6: Dry eye syndrome
option_7: Band keratopathy