Dystrophy
developmental & hereditary corneal abnormality
symmetric
due to faulty metabolism & or structure
not related to other systemic diseases
Expe
autosomml dominnt trait usual onset 20 or shortly after slowly progressive changes no systemic diseses no primry ocular disese histry centrlly loctd prmry involvement single layer of cornea
Cogan Microcystic
map dot fingerprint EBMD most common non hereditary male = female e asymmptomatic chronic irritation , photophobi, Va flunctutions, glare RCE ten percent very painful