Red eye is so common that most of us have experienced it. The red streaks that run over the sclera —the white part of the eye— often occur when we are tired or fatigued, and they can make your eyes feel uncomfortable, watery, or itchy.

The appearance of red eye can vary widely. It can look like there are many pink or red lines on the sclera, or alternatively the whole of the sclera may appear diffusely pink or red.

Red eye can occur in either eye, or both simultaneously. Here are a few of the most common symptoms, aside from the redness of the sclera: