Objective To observe the morphological changes of photoreceptor cells in rats with retinitis pigmentosa(RP)induced by N-methyl-N-Nitrosourea(MNU)and the effects of acupuncture against it.Methods A total of 16 SD rats were treated with one-time intraperitoneal injection of MNU(50mg/kg)to induce RP,and randomly divided into an acupuncture group and a model group,8rats in each one.In addition,4rats were selected as a control group.After model establishment,rats in the acupuncture group were treated with acupun...