Important IT Safety Rule
~Never Look Down the End of a Fiber Optic Cable~
Purpose of Rule:
If you look down the end of a fiber optic cable, the light can severely damage your eyes. In order to avoid injury, the rule is to not look down them.
Fiber Optic Cables
This graphic depicts what a fiber optic cable looks like. For more information on Fiber optic cables, go to:
http://www.globalspec.com/learnmore/optics_optical_components/fiber_optics/fiber_optic_cable
Eye Damage
Depending on how powerful the light is, some may only damage your retina but could possibly harm the cornea or lens.
Protection
If you are worried that you might accidentally look down the cable, you can get special eye-wear that protects against lasers including fiber optic cables.