Components of the Human Eye


The process that translates light into signals for your brain is intricate and complex. Here we have some of the many parts of the eye that help us to not only capture that light, but send it on to the brain, where it is decoded, translated, and then becomes an image.


The clear layer covering the eye helps refract light as it is coming into the eye.


This layer, the white of the eye, has six miniscule muscles attached to it to control the movement of your eye.


The colored part of the eye, the iris controls how much light comes into your eye through your pupil.


When light enters your eye, this small hole acts like an aperture in a camera to focus it. A smaller pupil is useful in brighter lit areas, but it widens in dimmer areas.


Once light passes through the pupil, it gets to the lens, which further refracts it, just as the cornea did earlier. The lens changes the focal distance of the eye so that you can focus on objects at different distances.


Millions of sensors called photoreceptors are in the retina, and they convert light into electrical impulses. There are two types of photoreceptors – rods and cones. Rods help you see in low light, and cones help you see in bright light and help you see colors as well.

Optic Nerve

Once the light becomes electrical impulses, the optic nerve sends them back to the brain.

Leave a Reply