On Mon, 3 Mar 2008 11:36:15 -0500, Jonathan Katz wrote: > Looking at the light is bad for your eyes. Out of curiosity, got any references for that ? Work claims that multi-mode is safe; single-mode is dangerous. Elsewhere (the FOA website) it is claimed that both are safe unless you peer down a fibre with a microscope that has had the infra-red filter removed!