In closed angle, there is contact of the peripheral iris with the trabecular meshwork (iridotrabecular contact) at the entrance to Schlemm's canal (1).
When these changes results in glaucomatous optic neuropathy it is termed as primary angle closure glaucoma (1).
The condition is frequently bilateral and its incidence increases with age. 90% of acute attacks are unilateral (2).
Often, closed angle glaucoma presents acutely as a painful red eye.
Last reviewed 01/2018