NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Brad Morris
Date: 2018 Jun 13, 16:03 -0400
Dear Brad,
Thank you for the story (of never looking into the laser beam).
That reminded me my own experience with HeNe laser (sub-milliwatt, I guess). Despite being VERY SERIOUSLY warned I decided that a ~5cm thick pack of coal-black filters (each exceeding a DIN12 welding mask) will save my sight and still let me see the light from the laser.
It was not so easy to find the beam, when I moved my head around to colineate with the beam - I saw a lot of fancy interference patterns (so many filters in the pack created a lot of internal reflections). Finally I foung the main beam.
My brain - not even my eye alone! - was filled with the true meaning of Red, the Very Absolute Sense of it.
Quite satisfied with myself and with the experience thus obtained I moved away from the beam. The eye was still working just fine - to my great satisfaction. But few seconds later there came a feeling as if that eye got professionally hit by a heavy-weight boxer! Now I subscribe to the warning of never ever looking into a laser beam, no matter the power could be!
Many years passed, my sight is still good - with both eyes.
Regards,
Tony
