What is non-glaucomatous optic neuropathy?

What is non-glaucomatous optic neuropathy?

Non-glaucomatous optic neuropathy (NGON) was defined as clinical evidence of impaired optic nerve function in the absence of field or disc changes of glaucoma.

What is glaucomatous cupping?

Individuals with glaucoma have increased IOP or consequent loss of blood flow to some regions of the eye, resulting in the death of optic nerve cells. The center of the optic disc (known as the cup) becomes larger, and the cup to optic disc ratio increases alarmingly. This process is referred to as optic nerve cupping.

What causes optical cupping without glaucoma?

Aneurysm of the small intracranial portion of the internal carotid artery has been reported to cause cupping as well as VF defects similar to those seen in glaucoma. Likewise, compressive tumors can cause progressive cupping and VF defects that can be difficult to differentiate from glaucoma.

Can you have optical cupping without glaucoma?

Patients who have non-glaucomatous cupping of the optic nerve tend to have lower visual acuity; studies have found that vision less than 20/40 may indicate non-glaucomatous cupping associated with intracranial masses.

Does cupping always mean glaucoma?

Both people with and without optic nerve damage have optic nerve cupping, although those with glaucoma tend to have a greater cup-to-disc ratio. A cup to disc ratio greater than six-tenths is generally considered to be suspicious for glaucoma.

What causes optic nerve cupping?

It is rare that other optic neuropathies result in cupping of the optic nerve. Most of the time, optic nerve head cupping is caused by glaucoma, and the amount of vision loss corresponds to the extent of cupping.

What are the symptoms of advanced glaucoma?

The symptoms of advanced glaucoma often vary from person to person. The patient might perceive difficulty with different visual functions such as reading, outdoor activities, driving, seeing at nighttime and usually his/her eyes tire easily with different visual functions.

How does glaucoma affect the optic nerve?

There are several effects of glaucoma on the optic nerve. Some of the ways glaucoma effects the optic nerve include vision impairment and increased eye pressure that may press against the optic nerve itself. When the optic nerve becomes irreparably damaged due to glaucoma, blindness may occur as a result.

Is optic nerve cupping normal?

“Cupping”. The normal optic nerve has a healthy appearing “rim” of tissue, which is assessed by both the contour of the rim as well as the color. “Cupping” is the result of changes in the optic nerve related to optic nerve degeneration, where there is a backward bowing of the central part of the disc.