Pardos G J, Meltzer D W
Arch Ophthalmol. 1983 Apr;101(4):562-3. doi: 10.1001/archopht.1983.01040010562005.
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.
在两例计划进行角膜移植的病例中，供体角膜片的边缘被从一次性环钻转移来的黑色污染物染成了变色。来自两个不同制造商的环钻都出现了同样的问题。扫描电子显微镜和能量色散X射线分析表明，污染物是来自环钻的不锈钢颗粒和用于 sharpening 的碳化硅磨料的混合物。 （注：原文中“sharpening”此处可能有误，推测可能是“manufacturing”之类更符合语境的词，但按要求未修改直接翻译）
