[Fluorescein angiographic studies of the effect of Harms' and Dannheim's trabeculotomia ab externo].

The mechanism of the outflow of the aqueous humor was investigated on 9 eyes with open angle glaucoma operated by traveculotomia ab externo. The anterior chamber was filled with 0,2% Fluorescein-Ringer-solution, before and after the operation. Comparing the fluorescein angiographic pictures it can be concluded that the effect of the operation it caused by an improvement of the outflow of the aequous humor through the system of Schlemm's canal as well as through the formation of a fistula.