I suspect that no one has ever really gone blind from watching an eclipse. Though I don't recommend you stare at the next available eclipse just in case it turns out I was wrong once in my life, it seems a far-fetched consequence. I remember in college when I took astronomy to satisfy my basic math requirement and my professor talked about the guy who discovered spots on the surface of the sun. He found them by looking at the sun through a telescope, and he would later hypothesize that either we were moving around the sun or it was rotating since he observed the spots moving laterally. What I'm saying is that if a guy could stare at the sun through a telescope, it seems that one quick glance during an eclipse will not burn your retinas out of your skull, though it might not be a bad idea to wear a welding mask just to be safe.