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What is The most frequent cataract type seen in adult Retinitis pigmentosa patient is – and explain in detail?
Retinitis pigmentosa is associated with posterior subcapsular cataract (PSC).

"Retinal pigment degenerations such as retinitis pigmentosa , Usher's syndrome and gyrate atrophy are associated with cataract, which are usually subcapsular opacities".

—Yanoff & Duker