Doctor performing a glaucoma exam on patient

Glaucoma damages the optic nerve

Glaucoma is a leading cause of blindness in the United States. Early treatment can often prevent loss of sight. Glaucoma affects the optic nerve. The optic nerve is made up of many nerve fibers that carry images to the brain. It’s like an electric cable containing numerous wires. When glaucoma damages the optic nerve fibers, blind spots develop. If the entire nerve is destroyed, blindness results. Glaucoma is often related to an increase in intraocular pressure (IOP), although this is not always true.

Glaucoma Chart


There are several types of glaucoma

Primary Open-Angle Glaucoma is the most common form of glaucoma in the United States, in which aqueous fluid is blocked from flowing back out of the eye at a normal rate through its natural drainage system. Typically, open-angle glaucoma has no symptoms in its early stages, and vision remains normal. As the optic nerve becomes more damaged, blank spots begin to appear in your field of vision. You typically won’t notice these blank spots in your day-to-day activities until the optic nerve is significantly damaged and these spots become large. If all the optic nerve fibers die, blindness results.

Angle-Closure Glaucoma is a condition where the iris (the colored part of the eye) can move and cause the drainage angle in the eye to become closed off, leading to a sudden increase in IOP and potential optic nerve damage. This condition is considered an emergency—optic nerve damage and vision loss can occur within hours. Symptoms of angle-closure glaucoma may include nausea, seeing halos around lights, and eye pain.

Normal-Tension Glaucoma is a condition where IOP remains normal, but vision loss occurs. This condition is not well understood, but progression can be slowed by lowering IOP.
Childhood Glaucoma may start in infancy and may be cause by heredity. Signs of Childhood Glaucoma may include clouding of the cornea (the clear part of the eye), eye enlargement, and tearing.
Routine eye exams typically involve a glaucoma test, involving a puff of air to determine the IOP. Early detection of glaucoma is critical to better treatment outcomes. The doctors of Magruder Eye Center recommend bi-yearly testing, especially for those over the age of 50.

Treatment Options

There are several treatment options available for glaucoma:


Prescription medications are often used to help patients control IOP. Medical management of glaucoma is under care of your eye doctor who will prescribe the medication and closely monitor effectiveness.

Cypass® Macro Stent

Cypass is a tiny implant for cataract patients that has helped thousands of people with glaucoma successfully manage their intraocular pressure. The device is surgically implanted during cataract surgery and re-opens drainage so IOP stays at normal levels. For patients who have been managing IOL with medication, Cypass eliminates this need and provides a consistent way to manage glaucoma.

SLT (Selective Laser Trabeculoplasty)

This is a simple laser treatment that uses your body’s own healing response to improve fluid flow and relieve pressure. SLT uses a laser to target cells containing melanin, a natural pigment. SLT uses an advanced laser system to target only specific cells of the eye—those containing melanin, a natural pigment. This causes a regenerative response that improves fluid outflow and naturally relieves pressure. Only cells that need to be targeted are affected. Other tissues are intact. The procedure only takes a few minutes.

If you have experienced any symptoms listed above, it is critical that you schedule an appointment with an eye doctor immediately. Call Magruder Eye Institute and describe your symptoms and ask to be seen as soon as possible.