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The accommodation reflex requires detection of a focused image on the retina, so the cortical visual pathway (lgn to primary visual cortex) is involved. The pretectal area receives an input from the visual cortex, and from there there is a parasympathetic pathway innervating the ciliary muscle, similar to that of the pupillary constrictor. The reflex is antagonised by passive tension in the suspensory ligament, so there is no sympathetic innervation of the ciliary muscle.