[Acute open-angle glaucoma in a woman with AS hemoglobinopathy].

A 64-year-old black woman presented unilateral acute ocular hypertension. Gonioscopy showed a blood clot obstructing Schlemm's canal. Intraocular pressure returned to normal values after resorption of the blood clot. Hemoglobin electrophoresis found a sickle-cell trait, raising the hypothesis that the obstruction of outflow was probably due to the mechanism of sickling.