<prompt> Which of the following is not a true statement for retinitis pigmentosa?Electrophysiological changes appear early in the disease before the objective signsTriad includes Attenuated vessels. optic atrophy and disc edemaRP is associated with Cystoid macular edemaArgus 2 retinal implant is used as a treatment modality  <response>: Disc edema is not considered as a pa of triad of retinitis pigmentosa. Retinitis Pigmentosa Triad: Peripheral pigmentation Optic atrophy Attenuated vessels. 