<prompt> Corneal dystrophies are usually -Primarily unilateralPrimarily bilateralcPrimarily unilateral without systemic diseased Primarily bilateral with systemic disease  <response>: Corneal dystrophies are inherited disorders in which the cells have some inborn defects due to which the pathological changes may occur with passage of time leading to development of corneal haze in otherwise normal eyes that are free from inflammation or vascularization.Dystrophies occur bilaterally manifesting occasionally at bih. REF:Comprehensive ophthalmology,AK Khurana,6th edition,pg no.124 