Did you know that snakes could have blue, red, and even green eyes? Although most snakes have yellowish eyes with slit pupils ...

Allergic reactions and dry eyes may trigger dark circles. When you have an allergic reaction, your body releases histamines to fight off the invader. This may cause itchy, red, and puffy eyes.

It a process of the human eye called dark adaptation ... Systems is another good choice for an observing light. It has two red LEDs and is dimmable over a nice range. Credit: Michael E.

Ageing, eye strain, smoking, or even genetics caused by thin skin around your lower eyelid can all be culprits for those pesky shadows. But sometimes, those dark circles are waving a red flag for ...