You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Optic disc changes of retinitis pigmentosa: and explain in detail?
Retinitis pigmentosa (RP) is a type of retinal dystrophy predominantly effecting the rod photo receptor cells of the retina with subsequent degeneration of the cones Sporadic: most common Clinic - investigative features Night blindness May occur before the retinal changes appear. Fundus changes Retinal pigmentary changes occur in the form of perivascular deposition (jet black spots) of bony corpuscle pigments in the equatorial region which later spread both. Anteriorly and posteriorly Retinal aerioles are attenuated Optic disc becomes pale waxy ending in consecutive optic atrophy. Visual field changes Annular of ring scotoma Tubular vision in advanced cases - Electrophysiological changes Appears even before the subjective symptoms and signs Scotopic flash ERG: decrease in amplitude of the 'a' wave EOG is extinguished