Glaucoma is a group of related eye disorders that all cause damage to the optic nerve that carries information from the eye to the brain. Glaucoma usually has little or no initial symptoms.
In most cases, glaucoma is associated with high pressure inside the eye, a condition called ocular hypertension. It can occur when intraocular pressure (IOP) is normal. If untreated or uncontrolled, glaucoma first causes peripheral vision loss and eventually can lead to blindness in later stages.
According to the Academy of Ophthalmology, the most common type of glaucoma called primary open-angle glaucoma affects millions people worldwide, and that number is expected to increase.
Because most cases of glaucoma have few or no early symptoms, people with glaucoma don’t know they have it.
Glaucoma is the second-leading cause of blindness today. behind macular degeneration, and the second-leading cause of blindness worldwide behind cataracts.
Types of Glaucoma in Kerry Drivers
The two major categories of glaucoma are open-angle glaucoma (OAG) and narrow angle glaucoma(NAG). The “angle” in both cases refers to the drainage angle inside the eye that controls the outflow of the watery fluid called aqueous, that is continually being produced inside the eye.
The aqueous access the drainage angle, glaucoma is known as open angle glaucoma. If the drainage angle is blocked and the aqueous can’t reach it, the glaucoma is known as narrow angle glaucoma(NAG).