Sight
Sight
Sight (pronunciation: /saɪt/), also known as vision, is the ability to interpret the surrounding environment by processing information contained in visible light. The etymology of the word "sight" comes from the Old English "sihth", which means something seen.
Anatomy of Sight
Sight is made possible by the complex interaction of the eye, the optic nerve, and the brain. The eye captures light and converts it into electrical signals. These signals are then transmitted to the brain via the optic nerve, where they are interpreted as images.
Eye
The eye is the organ that detects light. It is composed of several parts, including the cornea, the iris, the lens, and the retina.
Optic Nerve
The optic nerve is a bundle of nerve fibers that transmits visual information from the retina to the brain.
Brain
The brain interprets the electrical signals sent by the optic nerve, allowing us to perceive and understand what we are seeing.
Disorders of Sight
There are many disorders that can affect sight, including myopia (nearsightedness), hyperopia (farsightedness), astigmatism, and cataract. These conditions can often be corrected or managed with glasses, contact lenses, or surgery.
Related Terms
- Visual perception: The ability to interpret the surrounding environment by processing information contained in visible light.
- Visual acuity: A measure of the spatial resolution of the visual processing system.
- Color vision: The ability of an organism or machine to distinguish objects based on the wavelengths of the light they reflect, emit, or transmit.
External links
- Medical encyclopedia article on Sight
- Wikipedia's article - Sight
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