Non-ophthalmologists may perform a simple preliminary examination of corneal sensitivity with a distended cotton swab (see Fig. 1.11, p. 11). This examination also helps the ophthalmologist confirm the diagnosis in the presence of a suspected viral infection of the cornea or trigeminal or facial neuropathy as these disorders are associated with reduced corneal sensitivity. Ophthalmologists may use an automatic Drager esthesiometer for precise testing of corneal sensitivity and for follow-up examinations. This instrument can incrementally raise the sensitivity stimulus. This makes it possible to determine if and how rapidly corneal sensitivity increases following a corneal transplant.
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