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Wednesday, June 1, 2011

Pupil

usual size -ranges from 2-5 mm, determined by pupillary light reflex pathways (afferent & efferent), function of sphincter & dilator pupillae muscles

miosis- decrease in pupillary size (organophosphorous poisoning)
mydriasis- increase in pupillary size (atropine action)
cycloplegia- loss in accommodation reflex (atropine action)


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