Glaucoma is a common eye problem that is characterized by failure to maintain the balance in eye fluid production and drainage, resulting in an increase in intraocular pressure (pressure inside the eye). Glaucoma causes loss of vision and it is best to avoid this complication by seeking immediate medical attention when signs of increased intraocular pressure occur.
There are mainly five types of glaucoma: open-angle glaucoma, angle-closure glaucoma, normal-tension glaucoma, developmental glaucoma and pigmentary glaucoma. To understand this condition and identify causes of glaucoma, we will first discuss how glaucoma develops.
To understand how glaucoma leads to vision loss, you first must understand more about intraocular fluid movement in the eye:
The common causes of glaucoma include:
The most common cause of glaucoma is an increase in internal eye pressure but the disease can also occur when the intraocular pressure is normal. This condition is called normal-tension glaucoma, which occurs in people who have optic nerves that are highly sensitive to pressure even with normal IOP. The exact cause is unknown, but research suggests that narrowing (vasospasm) of blood vessels and decreased blood flow to the optic nerve may be one of the glaucoma causes.
Conventional methods used in testing for glaucoma involves screening for high intraocular pressure. However, glaucoma can occur even with normal IOP, so direct examination (fundoscopic exam) of the optic nerve as well as testing the visual field are important to diagnose glaucoma.
Immediate glaucoma treatment is necessary to protect the nerve cells of the eye from being damaged, which can lead to blindness. Common treatment include eye drops, laser surgery and microsurgery for glaucoma. And for different kinds of glaucoma, the surgery may vary. For example, Argon Laser Trabeculoplasty (ALT) is usually for open-angle glaucoma; Laser Peripheral Iridotomy (LPI) is for angle-closure glaucoma. Doctors will take the proper surgery for specific condition.
You can watch the following video for knowing more about glaucoma causes, symptoms, prevention and treatment options.