The symptoms experienced by individuals differ depending on the type of photoreceptors affected.
IRDs refer to a large group of genetic disorders that affect the retina. In most cases, the inherited gene defect only affects the eyes.
Sometimes, other parts of the body are also affected, and this is called syndromic RP. An example of syndromic RP is Usher syndrome, which causes both RP and hearing loss. Other examples include Refsum, Alström and Laurence-Moon-Bardet-Biedl (LMBB) syndromes.
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