There are spaces between structures in the front of the eye. Fluid can drain out of the eye through these spaces. In ACG, these spaces shrink. Fluid can not pass out of the eye well. The extra fluid in the eye causes pressure in the eye to increase. Acute ACG may happen when structures of the eye slip and block these spaces. Chronic ACG may be caused by changes in the eye that happen slowly over time.
It is not clear why these changes happen. Some factors that play a role include:
Blood flow problems to the eye
Injury to the eye
Conditions that cause thickening of the lens of the eye
Areas of the eye can rub against each other with chronic glaucoma. This can cause damage to the drain. It will make it harder for fluid to drain well.
Angle-Closure glaucoma. American Academy of Ophthalmology website. Available at:
https://www.aao.org/munnerlyn-laser-surgery-center/angleclosure-glaucoma-19. Updated December 18, 2013. Accessed February 12, 2019.
Angle-closure glaucoma. Glaucoma Research Foundation website. Available at: ...(Click grey area to select URL) Updated January 14, 2015. Accessed February 12, 2019.
What is glaucoma? American Academy of Ophthalmology website. Available at: ...(Click grey area to select URL) Updated April 15, 2018. Accessed February 12, 2019.