REPRESENTATION OF CORNEAL AND CONJUNCTIVAL SENSATION IN THE CENTRAL NERVOUS SYSTEM

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Abstract
THE CORNEA has generally been believed to have the property of receiving pain but not touch sensation. Thus, a wisp of cotton or a fine hair elicits a distinctly unpleasant sensation when it touches the cornea, and graded test objects are said to elicit no other type of sensation.1 Moreover, tactile end-organs have never been found in the cornea,2 and there is indirect evidence, such as absence of vibration sense and the uniform rate of cocaine-induced anesthesia, that is said to indicate absence of touch sensation in the cornea. But, as indicated in a recent review by Adler,3 the evidence is not unequivocal, and recent observations by neurosurgeons4 on patients who have had the trigeminal tractotomy of Sjöqvist5 have shown uniformly a persistence of nonpainful sensation in the cornea with loss of pain and temperature sensation in the face. This finding has been interpreted as

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