This is a question I keep hearing in class. At this NASA website, the experts set the record straight. Can looking at a solar eclipse lead to permanent vision loss? YES. Do not look directly at a solar eclipse! It is safe, however, to look with the naked eye only during the short phase of totality (a total solar eclipse) when the whole moon is blocking the sun. In partial eclipse or any other time, it is very important to use eye protection!!
http://eclipse.gsfc.nasa.gov/SEhelp/safety.html
At this website, Mr. Eclipse explains more about how to protect your eyes.
http://www.mreclipse.com/Totality2/TotalityCh11.html
Even staring at the Sun on a regular day is dangerous. Be careful!
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