Retinitis pigmentosa 9 (RP9) is a type of retinitis pigmentosa (RP) that is inherited in an autosomal dominant pattern. RP9 is a retinal dystrophy that causes narrowed retinal vessels, a typical fundus appearance, and changes in the eye's electrophysiological responses. Early signs of RP9 include night blindness and a narrowing of the visual fields. There is no specific treatment for RP9, but wearing UV sunglasses may help delay the onset of symptoms. For people with advanced disease, an artificial retina may be an option. ​

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RP is caused by genetic mutations that affect the rod photoreceptors in the retina. The loss of rod photoreceptors leads to night blindness and a gradual decline in peripheral vision. Eventually, the disease can affect central vision, which is needed for tasks like driving, reading, and recognizing faces. RP can also occur as part of syndromes that affect other organs and tissues in the body. RP is a chronic condition that causes vision loss over time. It's usually diagnosed by a medical professional, and lab tests are typically required.