[Ophthalmologic signs in a KBG syndrome, a rare genetic disease].

KBG syndrome, named after the initials of the first 3 families reported, is a rare genetic syndrome caused by a deletion or a mutation of ANKRD11 (ankyrin repeat domain-containing protein 11) gene. Its prevalence is probably underestimated because of a variable expressivity; moreover, most of its clinical characteristics are not specific. There is no consensus about its diagnostic criteria.