Red eyes upon waking are a common occurrence that can be caused by lifestyle choices, nonemergency conditions, or serious health issues. Learn about possible causes, along with treatment, and ...

When we see animals' eyes in photos, nature films, flashlight beams, and headlights we see them shining back at us — but human eyes only glow bright red ...

Dark = Wide Pupils: When it's dark, your pupils (the dark spots in your eyes) become really wide to admit more light. Flash: When the flash from the camera goes off, a sudden beam of bright light ...

Fire-red eyes burn in the dark. For a long time, you see nothing at all, your attention drawn only by a loud and suggestive rustling. But, you peer deeper into the tangled undergrowth, until an ind… ...