This is an automated involuntary blinking of the eyelids (See : Reflex) elicited by stimulation (such as touching or a foreign body) of the eyeball's cornea. The evolutionary purpose of this reflex is to protect the eyes from foreign bodies. The reflex is mediated by the 5th Cranial nerve (Trigeminal) sensing the stimulus on the cornea, and the 7th Cranial nerve (Facial) initiating the motor response. Use of Contact lenses may diminish or abolish this reflex. The examination of the corneal reflex is a part of some neuroloigcal tests. A reflex action or reflex is a biological control system linking stimulus to response and mediated by a reflex arc. ... Jump to: navigation, search The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber and provides most of an eyes optical power [1]. Together with the lens, the cornea refracts light and consequently helps the eye to focus. ... Cranial nerves are nerves which start directly from the brainstem instead of the spinal cord. ...
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A reflex is an involuntary muscular response to a sensory stimulus.
Absent or abnormal reflexes in an infant, persistence of a reflex past the age where the reflex is normally lost, or redevelopment of an infantile reflex in an older child or adult may suggest significant neurological problems.
Abnormal infantile reflexes are usually discovered by the health care provider during exams performed for other reasons, and the affected individual (or the parents in the case of an infant) may not have been aware of the condition.
A toe pinch reflex is lost at a variable period during the anesthetic episode; however, at surgical planes of anesthesia the toe-pinch reflex should be abolished.
The vent stimulation reflex (movement of the tail or leg in response to squeezing the vent) is lost at deeper planes of anesthesia and is often still present at light anesthesia.
The palpebral reflex is generally lost at light planes of anesthesia while the cornealreflex should be present at light surgical anesthesia.
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