At 30 angstroms -- a unit of measurement equal to one hundred millionth of a centimetre -- an obsidian scalpel can equal diamond in the fineness of its edge. Courtesy of Dr Lee Green.

He is also known for developing advanced microsurgical devices and instruments, such as a diamond scalpel for glaucoma surgery. In his keynote, "Rethinking Surgery as First Line Glaucoma Therapy," ...

At 30 angstroms -- a unit of measurement equal to one hundred millionth of a centimetre -- an obsidian scalpel can equal diamond in the fineness of its edge. Courtesy of Dr Lee Green.