Retinitis Pigmentosa Market Has Been Treading a Healthy Growth Path
Retinitis pigmentosa, in which patients usually lose night vision in teenage years, side vision in middle age, and central vision in later life because of steady loss of cone photoreceptor cells and rod. Measures of retinal function, such as the electroretinogram, indicate that photoreceptor function is reduced usually several years before visual-field scotomas, symptomic night blindness, or reduced visual acuity arise.
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