[Effect of trephination on the cut-edge of cornea]

Corneal buttons were cut from rabbit and human eyes by anterior trephination and scissor completion or by posterior punching. Light microscope was used to measure the inward bevelling of the corneal cut-edge. With anterior trephination, the apparent width of inward bevelling of rabbit corneal buttons was 0.757 +/- 0.232 mm; with posterior punching, the apparent width of inward bevelling was 0.466 +/- 0.161 mm, and the cut-edge was also smooth. The mechanism of cut-edge bevelling was discussed.