Eye
Eye
The Eye (/aɪ/; from Old English ēage) is a sensory organ responsible for vision. It detects light and converts it into electro-chemical impulses in neurons.
Anatomy
The human eye is a complex organ composed of various parts, each contributing to the overall function of vision.
- The Cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber.
- The Iris is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.
- The Pupil is a hole located in the center of the iris of the eye that allows light to strike the retina.
- The Lens is a transparent, biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina.
- The Retina is a thin layer of tissue that lines the back of the eye on the inside. It is responsible for receiving light that the lens has focused, converting the light into neural signals, and sending these signals on to the brain for visual recognition.
Function
The primary function of the eye is to receive light and convert it into neural signals that the brain can interpret as images. This process is known as vision.
Related Terms
- Optometry - the profession dedicated to eye health and vision care.
- Ophthalmology - the branch of medicine and surgery which deals with the diagnosis and treatment of eye disorders.
- Visual perception - the ability to interpret the surrounding environment using light in the visible spectrum reflected by the objects in the environment.
Etymology
The word "eye" comes from the Old English ēage, which itself is derived from the Proto-Germanic *augô.
External links
- Medical encyclopedia article on Eye
- Wikipedia's article - Eye
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