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Colour blindness refers to an inability to distinguish between some of the colours that others can perceive as different. It is often the result of a genetic deficiency, but can also result from eye, nerve, or brain damage, or exposure to particular chemicals.
As is briefly explained in How the Eye Works, the retina contains primarily two types of cells – rods and cones. Cones are responsible for colour perception. There are three types of cones, and each is sensitive to different wavelengths. The receptors are often referred to as – green, red, and blue,- though this distinction is not entirely accurate.
Keeping your eyes healthy is about more than just vision. Regardless of whether you sport glasses, contact lenses, or have no need for either, dark, puffy eyes signify aging, stress and sleep deprivation. Taking care of your eyes with an eye cream will help ensure that your eyes are bright, no matter what hours you’ve been keeping.
That being said, navigating the eye cream market can be a daunting task. To help you out, we’ve compiled a bit of information to introduce you to the world of eye cream.
It is widely accepted based on shared anatomical and genetic features that all animal eyes have the same origin, a proto-eye that evolved approximately 540 million years ago. That being said, the majority of advancements are thought to have occurred in the past few million years, in a burst of evolution known as the Cambrian explosion. Once the first predators developed true imaging capabilities, this set off an “arms race” as predators and prey competed to evolve equal and better capabilities in order to survive. As a result, many types and subtypes of eyes developed in parallel.
Eyes detect light, and send electrical impulses through the optic nerve to the visual and other areas of the brain. The functioning of the eye is often paralleled to the functioning of a camera, where external light is focused onto a light-sensitive medium. In the camera, this medium is film; in the eye, it is an array of visual receptors.