Usher syndrome (USH) is the most frequent hereditary cause of deafness associated to blindness. It is a rare disease, affecting 1 in every 10.000 individuals, with an autosomal recessive monogenic inheritance. Deafness is congenital while the retinitis pigmentosa is not detected before the age of 8 to 10. These patients suffer from a dreadful disability as their two major senses are impaired. Impo ...