Twin brothers Michael and Daniel Smith have an extremely rare condition for which there is no known cause or cure.
Leber's Optic Neuropathy is the loss of vision as a result of the death of cells in the optic nerve, causing it to stop relaying vital information from the eyes to the brain.
Although it is a hereditary condition, linked to a number of genes, the brothers have been unable to find any family history going back four generations.
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