Structure of the Eye
The human eye structure and function is a marvel of biological engineering, comprising several key components that work in harmony to enable vision. This simple eye diagram provides a comprehensive overview of the eye's anatomy and the roles of its various parts.
The cornea, the eye's outermost layer, refracts light as it enters the eye. Behind it lies the iris, which controls the size of the pupil, regulating the amount of light that enters the eye. The lens, located behind the pupil, focuses light onto the retina at the back of the eye.
Vocabulary: Refraction - The bending of light as it passes from one medium to another with a different density.
The retina contains receptor cells that detect light and convert it into electrical signals. These signals are then transmitted to the brain via the optic nerve, where they are interpreted as visual images.
Highlight: The retina's fovea is an area of concentrated cone cells, responsible for sharp, detailed vision.
Supporting structures include the suspensory ligaments, which attach the lens to the ciliary muscles. These muscles contract and relax to control the shape of the lens, allowing for focus adjustment.
Definition: Accommodation - The process by which the eye adjusts its focal length to maintain a clear image of objects at varying distances.
The eye's outer protective layer, the sclera, is commonly known as the "white of the eye." Beneath it lies the choroid layer, rich in blood vessels that supply nutrients to the eye.
Example: The pupil's ability to change size is similar to the aperture of a camera, adjusting to different light conditions.
This labelled diagram of the eye structure and function not only illustrates the complexity of the human eye but also demonstrates how each component contributes to the intricate process of vision.
