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George J. Pardos, MD; David W. Meltzer, MD, PhD

Arch Ophthalmol. 1983;101(4):562-563.

Abstract
• In two cases scheduled for corneal transplantation, edges of donor corneal buttons were discolored by a black contaminant transferred from the disposable trephines. Trephines from two different manufacturers produced this same problem. Scanning electron microscopy and energy-dispersive x-ray analysis indicated that the contaminant was a mixture of stainless steel particles from the trephine and silicon carbide abrasive used in sharpening.

Author Affiliations
From the Departments of Ophthalmology, Mount Sinai School of Medicine, New York (Dr Pardos), and Washington University School of Medicine, St Louis (Dr Meltzer). Dr Pardos is now in private practice in Denver.

Footnotes
Accepted for publication April 20, 1982.

Read before a meeting of the Castroviejo Society, Atlanta, Nov 6, 1981.

Reprint requests to Denver Clinic, 701 E Colfax, Denver, CO 80203 (Dr Pardos).

This study was supported in part by grant EY03615 from the National Eye Institute and by an unrestricted grant from Research to Prevent Blindness and the National Society to Prevent Blindness, New York.

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