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Retinitis pigmentosa is a group of related conditions associated with progressive degeneration of the light sensitive retina that lies at the back of the eye ball. This layer of photo sensitive cells with photoreceptors called rods and cones is normally associated with vision.
The rod photoreceptors normally provide black and white vision whole the cone photo receptors are associated with color vision. Rods are mostly affected but sometimes the genetic disorder affects the cones as well.
With the course of the disease there is degeneration of the retina and its capability to transmit images of meaningful vision reduces leading to complete loss of vision. Cells from the pigmented layer of the retina enter the layer containing nerve cells leading to typical pattern of black or brown star shape pigmentations in the retina that gives the diseases their name.
Symptoms of retinitis pigmentosa include:-