record linkage of the finnish twin cohort study with the hospital discharge registry and with the registry of rights to free medication kept by the social insurance institution gave following numbers of twin pairs with an ophthalmic disease ( one or both members of the pair had the disease ) in each disease category : 98 with glaucoma simplex ( 5 concordant pairs ) , 38 with capsular glaucoma ( no concordant pairs ) , 58 with iritis ( no concordant pairs ) and 149 with strabismus ( 2 concordant pairs ) .
C0015397
ophthalmic
C0038379
strabismus