Light touch on the cornea produces closure of that eye (a blink), or closure of both eyes if the stimulus is more intense. Afferent limb of reflex involves trigeminal ganglion cells whose distal axon branches run in the ophthalmic division of V and central branches which enter the descending tract of V and travel caudal, synapsing with cells in the interpolar part of the spinal V nucleus. Eventually motoneurons in the VIIth nucleus are activated, and they in turn produce contraction of the orbicularis oculi. (Note that the corneal reflex does not involve the upper lid, which is controlled by the IIIrd nerve. Also note it is a multisynaptic - not monosynaptic -relex.)