Abstract
Following division of the sensory root of the gasserian ganglion for the relief of trigeminal neuralgia, a subsequent anesthesia remains over the skin, the cornea and the conjunctiva supplied by the trigeminal nerve. This anesthesia is a sequela that the patient must accept in lieu of the excruciating pain that is associated with the disease. The anesthesia is not of any particular significance except in the cornea, where it allows the entrance of foreign bodies into the eye and the consequent abrasion of the cornea without the patient's knowledge. Injuries of this kind are extremely serious, since postoperative corneal ulcers heal slowly and often fail to respond to the usual treatment; they may result even in serious opacities of the cornea and finally in loss of vision. Hence, it is highly imperative that the patient protect the cornea, on the side operated on. For this purpose, a special corneal shield
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