<prompt> Answer this question truthfullyCould you explain what Cohen syndrome is?  <response>: <reason> The signs and symptoms vary due to variable expression. There are variable degrees of mental retardation with occasional seizure and deafness in Cohen syndrome.General appearance is one of obesity with thinelongated arms and legs.Ocular complications, though rare, are:Hemeralopia decreased vision in bright light iris retinal coloboma Microphthalmia Myopia Nystagmus Optic atrophy Pigmentary chorioretinitis StrabismusMicrognathia Short philtrum High vaulted palate 