<prompt> A female presented with progressive loss of vision during night since few months. Fundoscopy shows bone-spicule formation. Her two brothers and mother are also suffering with the same problem. Diagnosis is:PapilledemaMacular edemaCRAORetinitis pigmentosa  <response>: Retinitis pigmentosa is a group of heterogeneous hereditary retinal degenerations characterized by progressive dysfunction of the photoreceptors, associated with progressive cell loss and eventual atrophy of several retinal layers. Inheritance of the typical form can be autosomal recessive, autosomal dominant, or X-linked recessive. The hallmark symptoms of retinitis pigmentosa are night blindness nyctalopia and gradually progressive peripheral visual field loss as a result of increasing and coalescing ring scotomas. The most characteristic fundoscopic findings are attenuated retinal aerioles, waxy pale optic disk, mottling of the retinal pigment epithelium, and peripheral retinal pigment clumping, referred to as bone-spicule formation. Ref: Fletcher E.C., Chong N., Augsburger J.J., Correa Z.M. 2011. Chapter 10. Retina. In P. Riordan-Eva, E.T. Cunningham, Jr. Eds, Vaughan Asburys General Ophthalmology, 18e. 