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The experiments were prompted by the need felt in pharmacology of eyes with hypertension of easy availability, rather long duration and fairly constant levels, to allow observation of the effects of hypotensive agents and to study their mechanism of action. Single doses of 1 mg Triethyltin, a substance producing a hydrodynamic compromission of the brain, were injected into the anterior chamber of rabbit eyes. A rise in ocular tension, beginning within 24 hours and lasting seven to ten days is obtained in about 70% of eyes. The pressure increase ranged from 12 to 30 mm Hg. Biomicroscopic and histologic examinations evidenced an uveitis-like reaction in the first week after treatment. Neoprene casts evidenced an impaired vascularization in the ciliary processes and choroid. Topical and parenteral administration of the most commonly used antiglaucomatous drugs showed how well this hypertension responded to hypotonizing agents. The occurrence of producing an ocular hypertension in the untreated fellow eye following repeated intra-cameral injections of small dosage (1 microgram) of Triethyltin, every two days for more than one month, in the other eye is described. Hypertension resulted in 40% of eyes.