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Read Article Can a Solar Eclipse Really Blind You? " Research also suggests that while a lot of the damage may heal, some may be permanent. One 1995 study followed 58 patients who sustained eye damage after viewing a 1976 eclipse in Turkey. Healing occurred during the first month after the eclipse, the researchers reported in the journal Graefe's Archive for Clinical and Experimental Ophthalmology, but by 18 months, whatever damage remained was permanent up to 15 years later."

Click to read full article How can you tell if your solar viewer is  not  safe?  You shouldn't be able to see anything through a safe solar filter except the Sun itself or something comparably bright, such as the Sun reflected in a mirror, a sunglint off shiny metal, the hot filament of an unfrosted incandescent light bulb, a bright halogen light bulb, a bright-white LED bulb (including the flashlight on your smartphone), a bare compact fluorescent (CFL) bulb, or an arc-welding torch. All such sources (except perhaps the welding torch) should appear quite dim through a solar viewer. If you can see shaded lamps or other common household light fixtures (not bare bulbs) of more ordinary brightness through your eclipse glasses or handheld viewer, and you're not sure the product came from a reputable vendor, it’s no good. Safe solar filters produce a view of the Sun that is comfortably bright (like the full Moon), in focus, and surrounded by dark sky. If you glance at...

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