Measurement of the resistance to the aqueous flow by the electronic tonometer; results in cases of congestive glaucoma before and after treatment.

(1) The compression test performed with the electronic tonometer makes it possible to measure the resistance to the aqueous flow. (2) This resistance is greatly increased in congestive glaucoma during the hypertensive phase. It is sometimes temporarily increased in the fellow eye, even though the tension in this eye remains normal. Between the hypertensive crises, the resistance to the flow is normal both in the glaucomatous and in the fellow eye. (3) The instillation of pilocarpine restores the resistance to the flow to normal in cases where it restores a normal ocular tension. (4) After iridencleisis, the resistance to the flow at first falls below normal then returns to normal.