Do you know how our eyes and brain work together to see millions of colours? Well, here is all you need to know about colours and their role in our everyday life.

Christopher Terrell Nield does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations ...

An eye doctor has addressed a common source of confusion during routine eye exams, explaining how the process works in a now viral video. Dr. Claudine Courey, also known as Dr. C or @eyedropshop ...

Spiders usually have four pairs of eyes and there are two types: principal and secondary. Principal or direct eyes help the spider see detail; the photoreceptor cells of their retinas are at the front ...