Corneal nerve function can be assessed by measuring the sensitivity of the cornea in a technique termed aesthesiometry. Historically this was conducted with a Cochet-Bonnet aesthesiometer, a small hand-held device with a protruding nylon thread, the end of which is applied to the cornea to determine if contact is detected by the patient. If a subjective response to sensation is not elicited, the nylon thread is progressively shortened (making it stiffer) until sensation is detected.
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