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Results of the investigation of the oxyhaemoglobin content in the blood of the anterior ciliary veins in 23 patients with primary glaucoma and in 4 patients with senile cataract are presented. An extremely high content of oxyhaemoglobin in the anterior ciliary veins was revealed in all patients irrespective of the level of the intraocular pressure and the stage of the disease.

With age the eye drainage system undergoes a number of changes because less favorable conditions arise for intraocular fluid reflux. The manifestation and extent of these changes were closely connected with the manifestation of arteriosclerotic affection of the cardiovascular system. The changes in eye drainage passages in persons with pronounced complicated arteriosclerosis and advanced open-angle glaucoma were identical in character and comparable in the manifestation. The changes in eye drainage passages in persons with pronounced arteriosclerosis and open-angle glaucoma did not have the character of isolated trabecular lesion or lesions of Schlemm's canal or intrascleral tracts, but they were detected in all these sectors. The obtained data indicate that the changes in the eye drainage system connected with age pathology an open-angle glaucoma took place and were more pronounced in the superior sectors of the eye, gradually spreading downward. The conditions for intraocular fluid reflux along the primary tracts being deteriorated, its reflux appears to increase through the uveal tract.