1a. A group of diseases characterized by a persistent increase in intraoccular pressure, which causes pathological changes in the eye.

1b. Physical or functional obstruction of the filtration angle → decreased outflow of aqueous humor → increased intraocular pressure

The filtration angle in this picture is normal, but often the site of lesions that cause glaucoma	Note the changes causing occlusion of these filtration angles compared to the normal example to the left.
	Goniodysgenesis