Recently, with the ignore of our eyes for most people, optic neuritis is not an infrequent desease. People with optic neuritis may have symptoms such as blurry vision, distorted vision, decreased color vision, blind spots and will potentially suffer vision loss. In addition, it is estimated that the great majority of optic neuritis patients feel pain in the eye, which sometimes precedes the appearance of vision loss. Underlying changes caused by optic neuritis can be abnormal pupil appearance. The pupil performs abnormally that it will dilate instead of constricting in the presence of bright light. And the optic nerve may appear normal or swollen. Thus if you have these symptoms above, you'd better see a doctor to have a health check for the sake of your eyes as far as possible.