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n.1.(Med.) The operation of removing a cataract by thrusting a needle through the cornea of the eye, and breaking up the opaque mass.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
For the latter procedure, the needle was introduced either through the cornea, anterior to the iris (keratonyxis) or through the "sclerotic" (sclera), posterior to the iris (scleroticonyxis).
Arthur Jacob felt that using a needle through the cornea (keratonyxis) was the most easily performed operation for cataract and least traumatic to the eye.
One of the sketches was of Dr Jacob's curved needle for keratonyxis (Figure 2).