In a retrospective study we looked at the incidence of carotid artery stenosis in 191 ophthalmological patients, which underwent duplex sonography. In all these patients the oculist had considered carotid artery stenosis to be a possible reason for the present eye disease or visual disturbance. The incidence of stenosis found in these patients was compared to a group of 186 persons of the same mean age, which underwent routine-sonography without suffering from any symptoms related to carotid artery disease. Patients with amaurosis fugax, with occluded retinal veins and patients with glaucoma associated changes of the retina (in spite of normal eye pressure) suffered more often from carotis stenosis than asymptomatic persons (statistically significant), patients with occluded retinal arteries showed also more often carotid artery stenosis than the asymptomatic collective but without statistical significance. We conclude, that patients presenting with the mentioned symptoms should undergo carotid artery sonography. Furthermore these results could be of importance in evaluation the indication for carotid thrombendarterectomy (stadium II of cerebrovascular insufficiency).