Closed-angle glaucoma. This is a condition in which the pressure of fluid inside the eyeball builds up to harmful levels. In closed-angle, or acute, glaucoma, there is a blockage of the outflow of aqueous humour, the fluid that fills the eye. This leads to a rapid rise in fluid pressure, which can cause severe pain, blurred vision and inflammation of the eye. Acute glaucoma is a medical emergency, and treatment includes eye drops and pills to reduce the pressure. Surgery is then normally required to re-open the blocked humour drainage channel. If untreated, it can cause blindness.
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