There are "eye-safe" wavelengths that some laser diodes can operate at
(generally greater than 1300 nm). These are much less prone to damage eyes.
Basically your eyeball juice blocks the wavelength. Still, there is some
potential for cornea and lens damage at higher powers.
http://www.laserfocusworld.com/articles/2008/03/photonic-frontiers-eye-safe-lasers-retina-safe-wavelengths-benefit-open-air-applications.html
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