Accommodation

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Accommodation (medicine)

Accommodation (pronounced: əˌkɒməˈdeɪʃ(ə)n) is a term used in medicine to describe the process by which 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 word 'accommodare' which means 'to make fit, adapt, or suitable'. In the medical context, it was first used in the 19th century to describe the eye's ability to adjust its focus on objects at different distances.

Process

Accommodation involves the ciliary muscle, the zonule fibers, and the lens of the eye. When the ciliary muscle contracts, the lens thickens, increasing its ability to bend light and focus on near objects. When the ciliary muscle relaxes, the lens thins, allowing the eye to focus on distant objects.

Related Terms

  • Presbyopia: A condition that affects the eye's ability to focus clearly on close objects. It is often associated with aging and is due to a loss of accommodation.
  • Hypermetropia: Also known as farsightedness, is a condition where the eye has a greater difficulty focusing on near objects than on far objects. It is often due to a lack of accommodation.
  • Myopia: Also known as nearsightedness, is a condition where the eye has a greater difficulty focusing on far objects than on near objects. It is often due to an over-accommodation of the eye.
  • Astigmatism: A condition where the eye does not focus light evenly onto the retina, leading to blurred or distorted vision. It can be caused by irregularities in the shape of the cornea or lens.

See Also

External links

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