Accommodation (eye)
Accommodation (eye)
Accommodation (IPA: /əˌkɒməˈdeɪʃən/) is a process in the visual system where the eye changes optical power to maintain a clear image or focus on an object as its distance varies.
Etymology
The term "accommodation" is derived from the Latin accommodare which means "to make fit, adapt, or adjust". In the context of the eye, it refers to the adjustment of the eye's lens to maintain focus.
Process
In accommodation, the ciliary muscles within the eye contract which loosens the tension on the zonules. This allows the lens to become more convex, increasing the eye's optical power. The process is controlled by the parasympathetic nervous system via the Edinger-Westphal nucleus.
Related Terms
- Presbyopia: A condition where the eye exhibits a progressively diminished ability to focus on near objects with age, due to loss of accommodation.
- Myopia: Also known as nearsightedness, a condition of the eye where light focuses in front of, instead of on, the retina. This causes distant objects to be blurry while close objects appear normal.
- Hypermetropia: Also known as farsightedness, a defect of vision caused by an imperfection in the eye, causing inability to focus on near objects.
See Also
External links
- Medical encyclopedia article on Accommodation (eye)
- Wikipedia's article - Accommodation (eye)
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