Human eye
Human Eye
The Human Eye is an organ that allows for vision. It is part of the Visual System and is responsible for receiving light and converting it into electrochemical impulses that the brain can interpret as images.
Pronunciation
- /ˈhjuːmən aɪ/
Etymology
The term "Human Eye" is derived from the Old English "ēage," which is akin to the Old High German "ouga," both meaning "eye." The term "human" comes from the Latin "humanus," meaning "of man."
Structure
The human eye is a complex structure composed of several key components:
- Cornea: The clear front surface of the eye that helps to focus light.
- Iris: The colored part of the eye that controls the amount of light that enters the eye.
- Pupil: The black circular opening in the iris that lets light in.
- Lens: The transparent structure behind the iris that helps to further focus light.
- Retina: The light-sensitive layer of tissue at the back of the eye that translates light into nerve signals.
- Optic Nerve: The nerve that transmits visual information from the retina to the brain.
Function
The human eye functions by receiving light, focusing it through the cornea and lens, and translating it into images through the retina and optic nerve. This process allows us to perceive and interpret the world around us.
Related Terms
- Visual Acuity: The sharpness of vision, usually measured with a Snellen chart.
- Visual Field: The total area in which objects can be seen in the peripheral vision while the eye is focused on a central point.
- Visual Perception: The ability to interpret the surrounding environment by processing information contained in visible light.
See Also
External links
- Medical encyclopedia article on Human eye
- Wikipedia's article - Human eye
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