Accommodation (vertebrate eye)
Accommodation (vertebrate eye)
Accommodation (pronunciation: /əˌkɒməˈdeɪʃ(ə)n/) refers to the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies. This process is achieved by the lens changing its shape.
Etymology
The term "accommodation" is derived from the Latin word "accommodare" which means "to make fit, adapt, or suitable". In the context of the vertebrate eye, it refers to the eye's ability to adjust its focus on objects at varying distances.
Process
Accommodation involves the contraction of the ciliary muscle, which controls the shape of the lens. When the ciliary muscle contracts, the lens thickens, increasing its ability to focus on nearby objects. Conversely, when the ciliary muscle relaxes, the lens becomes thinner, allowing the eye to focus on distant objects.
Related Terms
- Presbyopia: A condition in which the eye exhibits a progressively diminished ability to focus on near objects with age, due to loss of elasticity of the lens.
- Myopia: Also known as nearsightedness, a condition where distant objects appear blurry because the eye focuses images in front of the retina instead of on it.
- Hyperopia: Also known as farsightedness, a condition where near objects appear blurry because the eye focuses images behind the retina instead of on it.
- Astigmatism: A condition where the eye does not focus light evenly onto the retina, leading to distorted or blurred vision at all distances.
See Also
External links
- Medical encyclopedia article on Accommodation (vertebrate eye)
- Wikipedia's article - Accommodation (vertebrate eye)
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