Why is it dangerous to look directly at the sun wtith sunglasses?

Because the light of the sun is so bright (and that includes components outside the visible range, such as ultraviolet light) that it can very quickly cause permanent eye damage (via destruction of the light-sensitive cells in the retina, initially); ordinary sunglasses simply don’t provide enough attenuation of the light passing through them to make the sun dim enough to safely view in this manner.

Direct viewing of the sun should not be attempted without using a filter specifically approved for this purpose. Welding filters of shades 12–14 are an example - and these are so dark that they’ll appear practically opaque if you look through them at a normally-lit scene!


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