[Ocular manifestations in porphyria cutanea tarda].Orv Hetil. 1992 Nov 15; 133(46):2971-3.OH
Ninety two patients suffering from porphyria cutanea tarda were examined ophthalmologically in a paired case-control study. The incidence of pinguecula and that of pterygium were 8 times and 2 times higher, respectively, in PCT patients that in the control group. The photodamage of the conjunctiva is presumed to be a result of the photoactivity of uroporphyrin in the tissues.