[Difficulties and errors in the diagnosis of retinoblastoma].

The authors analyzed the results of the clinical and histopathological examination of the eyes of 283 children with an initially diagnosed intraocular tumor. In 32 cases (11.4 p.

[Surgical treatment of pigmentary nevi of the conjunctiva].

Eighty persons with histopathologically confirmed diagnosis of pigmentary conjunctival naevi were operated upon in the period 1977-1986. Subjected to an analysis were the age and the sex of the patients as well as the localization, size and histopathological type of the change. Neither of the treated patients showed any naevus turning malignant and there were no recurrences.

[Orbital invasion and recurrence of retinoblastoma].

The authors present a clinical material comprising 94 children (55 boys and 39 girls) with unilateral (28) or bilateral (66) retinoblastoma. The period of observation amounted 5 to 15 years. In 84 children they found advanced changes responding to the fifth grade of the Reese-Ellsworth classification.

[Secondary glaucoma after cobalt therapy of a choroidal melanoma].

The clinical material comprises 157 patients of both sexes treated by means of 60Co plate and xenon photocoagulation for choroidal melanoma. The period of observation amounted 5 to 18 years. Secondary glaucoma occurred in 71 eyes (45.

[Initial investigations on the activity of some enzymes from the vitreous and lens of rabbit eyes exposed to cadmium and zinc].

The toxicological activity of zinc and cadmium is also connected with the negative influence of both compounds on the visual system. The activity of AspAT and AlAT was determined in 68 vitreous bodies and 68 lenses of rabbits exposed to the influence of zinc and cadmium compounds. Under the influence of these compounds the activity of AlAT was higher in the vitreous as well after using the cadmium or the zinc salts.