Define narrow angle glaucoma?

Fluid obstruction: Narrow angle glaucoma is the condition in which the lens and iris are too far forward in the eye, and when pupillary dilation occurs some of these will have obstruction of the fluid outflow tract (meshwork) causing a dangerous elevation of the eye pressure (narrow angle glaucoma or acute glaucoma) which is a medical emergency.

A type of glaucoma: Typically, a shorter eye or anteriorly rotated ciliary body with a lens that is taking up room in the anterior chamber causing a narrow spacing from the iris to the trabecular meshwork drain of the eye. There is a spectrum of open, narrow and closed.

Narrow angle highiop: Narrow angle glaucoma is a condition where the eye pressure is elevated due to mechanical blockage of the trabecular meshwork by the peripheral iris.