Laser Nigel
Thanks for info. If it had been anyone else but Richard Feynman I would have disregarded the statement: I'll try to relocate the article again. With a windshield as think as an aircraft's, and typically a metallic film with enough substance to carry heating current, I would still be surprised if an amateur could blind a pilot. Also, I would have thought the angle that would have to be used, would be difficult to attain.
Incidentally, in the case of diabetic retinopathy, what is the diameter of the beam at the retina? 'scuse the thread slippage.