In the period of 15 years authors had the opportunity to observe unilateral prepapillary and peripapillary (preretinal) vascular loops in 14 patients. Eight of them had the initial examination in a different time after the first manifestation of vitreous hemorrhage. Morphological appearance of loops was divided into 5 cathegories according to simillarity of ophthalmoscopic and angiographic featu- res. Only arterial loops were complicated by retinal and vitreous hemorrhage which resolved spontaneously.

        Key words: congenital vascular anomalies, vascular loops, vitreous and retinal