Everything about The Accommodation Reflex totally explained
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.
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.
Pathway
Light from each retina is taken to the
occipital lobe via the
optic nerve and
optic radiation, where it's interpreted as vision. The
peristriate area 19 interprets accommodation, and sends signals via the
Edinger-Westphal nucleus and the
3rd cranial nerve to the
medial rectus muscle.
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