Talk:Accommodation reflex

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WikiProject Medicine / Ophthalmology (Rated C-class, Mid-importance)
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Introductory paragraph[edit]

Regarding: "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)." "Focusing on a near object" is called "accommodation", therefore, the essence of the statement is "the accommodation reflex is a reflex in response to accommodation". The sentence would be more accurate if that part read "viewing a near object". The last phrase (i.e. "then looking at distant object (and vice versa)" should be removed because viewing a distance object is not actually part of the reflex.

Regarding: "It is dependent on cranial nerve II (afferent limb of reflex), higher centres and cranial nerves III, IV and VI (efferent limb of reflex)." Unless there is some new theory, I don't believe IV and VI are involved in the reflex. Edwardian 06:35, 21 July 2005 (UTC)

You raise good points. Technically it is true that IV is not involved... but only if you're in the the horizontal (transverse) plane of the eye. Generally, that exception aside I do believe IV is important 'cause you can't look up and down without it relaxing or contracting. It might be a question of definition... not sure. VI controls the lateral rectus and that muscle has to relax... tone has to decrease ('cause it is opposes the medial rectus). A reference would be a good thing... Nephron 07:13, 21 July 2005 (UTC)
Regarding "you can't look up and down without it relaxing or contracting": I'm not sure what you mean by "it" - the superior oblique muscle (innervated by IV) or the ciliary muscle? I don't think the accommodation reflex is dependent on IV and VI because you CAN look up or down or to the side and not accommodate. Edwardian 18:05, 21 July 2005 (UTC)