In 25 eyes suffering from primary open angle glaucoma the facility of outflow was measured before and 1 to 3 months after surgery in consideration of the rigidity. Trabeculotomy improved the facility on an average of 0.14+/-0.02 to 0.28+/-0.03 units. This means that the outflow resistance is decreased from 10.58+/-1.34 to 4.31+/-0.45 units. The statistically highly significant improvement of the outflow conditions must be a consequence of the surgical opening in the trabecular meshwork as the sclera had been closed watertightly at the end of the trabeculotomy. The coefficient of rigidity (graphically determined by applanation tonometry and Schiötz tonometry in recumbent position) was decreased from 0.0208+/-0.0010 to 0.0172+/-0.0008. This means that measuring the intraocular pressure postoperatively with a Schiötz tonometer results in data which are 3.08+/-0.65 mm Hg lower than the actual pressure level.
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