Angle closure glaucoma occurs in less than 10% of patients with glaucoma. Normally, aqueous fluid drains into the anterior chamber angle. When the angle narrows, there is a reduction in fluid outflow, resulting in an increase in eye pressure. Angle closure glaucoma is more common in longsighted people, as the eye tends to be smaller, thereby making the angle narrower. It is also more common as we get older because the lens inside the eye grows, pushing the iris forward. Comprehensive eye examinations are important in the detection of narrow angles as early treatment can prevent actual closure of the angle as well as prevent permanent loss in your field of vision. In the event that the angle closes, there will be rapid increase in eye pressure. This is because aqueous fluid can no longer flow out of the eye as the drainage system is blocked by the pupil. High eye pressure can cause pain, redness and even vomiting. If you experience these symptoms, seek urgent ophthalmic advice.