• Blurred vision in one or both eyes (especially after exercising or taking a hot bath)
• Dim vision (as if the lights were turned down)
• Abnormal color vision (dull and faded colors)
• Pain behind the eye, particularly when moving the eyes

The symptoms described above may not necessarily mean that you have optic neuritis. However, if you experience one or more of these symptoms, contact your eye doctor for a complete exam. Treatment
Optic neuritis usually occurs suddenly. If you experience any of the symptoms listed above, call your ophthalmologist. By looking in the back of your eye with an instrument called the ophthalmoscope, your ophthalmologist can see any optic nerve swelling. Optic neuritis may be confused with other causes of poor vision. Other tests such as color vision, side vision, and the reaction of the pupil to light may be performed. Ultrasound or magnetic scanning or visual brainwave recordings may be needed.