Accommodation reflex

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The accommodation reflex is a reflex action of the eye, in response to focusing on a near object, then looking at distant object (and vice versa), comprising coordinated changes in vergence, lens shape and pupil size. It is dependent on cranial nerve II (afferent limb of reflex), higher centres and cranial nerve III.

Light from a single point of a distant object and light from a single point of a near object being brought to a focus.

A near object (for example, a computer screen) appears large in the field of vision, and the eye receives light from wide angles. When moving focus from a distant to a near object, the eyes converge. The ciliary muscle contracts making the lens more convex, shortening its focal length. The pupil constricts in order to prevent diverging light rays from hitting the periphery of the retina and resulting in a blurred image.

[edit] See also

• Accommodation (eye)
• Pupillary reflex
• Ciliary muscle
• Presbyopia

[edit] External links

• Accommodation
• Exam of cranial nerve II - accommodation is usually tested as a part of this exam.

tr:Akomodasyon refleksi

uk:Акомодація ока

This page uses content from the English-language version of Wikipedia. The original article was at Accommodation reflex. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikipedia is available under the GNU Free Documentation License.