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From SNPedia

LCA (Leber Congenital Amaurosis) is the most form of congenital blindness. LCA causes blindness from birth or during the first few months of life. The disorder affects 1 in 30,000 newborns, and is currently incurable. Discovery of the CEP290 gene and a single mutation found in 20 percent of LCA patients will significantly speed up the genetic testing process for blind children.

A single mutation that accounts for 20% of childhood blindness

Another form of blindness also named after Leber is Leber's Hereditary Optic Neuropathy (LHON) , also known as Leber's Optic Atrophy (LOA).