What are the signs of optic neuritis?
Symptoms of optic neuritis usually come on suddenly and may include blurry or dim vision (as though the lights are being turned down) and a fading of colors. There can also be pain in the eye socket, impaired depth perception, and blind spots in the field of vision. Loss of vision usually occurs over a period of 2 to 5 days and generally improves within 4 to 12 weeks. The condition can be difficult to diagnose because the symptoms are similar to those caused by several other eye problems. One of the first steps in diagnosing optic neuritis is an examination of the optic nerve with an instrument called an ophthalmoscope. The optic nerve enters the back of the eye and is visible to the doctor as a small disc. Any swelling of this inside part of the nerve can be detected, but if the swelling occurs behind the eye, it is not visible and other diagnostic procedures are necessary. These procedures may include tests such as an ultrasound, CT scans, or visual brain wave recordings. Other stand
