<prompt> Corneal dystrophies are:Primary and unilateralPrimary and bilateralPrimary, bilateral, with systemic diseasePrimary unilateral without systemic disease  <response>: Corneal dystrophies are primary, bilateral and inherited disorder manifesting occasionally at bih but more usually during first or second decade and sometimes even later in life. Corneal dystrophies are of 3 types: anterior dystrophy, stromal dystrophy and posterior dystrophy. 