Thanks to our eyes, we are able to see the world clearly. Our eyes allow us to distinguish hundreds of thousands of colors and can adjust to let us see in very bright or very dark environments.
The eye is a highly complex organ. In simple terms, it gathers processes light from the environment to form our vision. But to provide us with such high-quality sight, various structures exist within the three main layers of the eye.
The white part of the eye is the sclera, which is the outer layer. Its surface is coated with the conjunctiva to protect against particles.
When light enters, it strikes a thick sheet called the cornea, focusing the light as it enters the pupil – a tiny hole. The colored part of the eye, the iris, changes the pupil size to adjust how much light enters. Behind the iris is a clear, elastic sheet called the lens that focuses the light further as it reaches the retina, which absorbs light and relays the information to the optic nerve of the brain.
Additionally, much of the eye is filled with fluid. Ahead of the lens, the eye is filled by the aqueous humor, made from clear, watery fluid. Behind the lens is a jelly-like substance called vitreous humor. These fluids maintain the roundness of the eye.
In this parts of the eye diagram quiz online, you’ll be able to learn more about the complex structures that make up the eye, and connect them better to their corresponding functions.