The total solar eclipse will be seen Aug. 21 across the U.S. Whether you're in the path of totality or hope to take a peek at the partially eclipsed sun elsewhere, here's how to keep your eyes safe, according to NASA.
1. It isn't safe to look directly at the sun, except during the total phase of a solar eclipse. But that time is brief, and will only be seen in the narrow path of totality (find a map at eclipse2017.nasa.gov).
2. Special solar filters allow wearers to safely look at the sun (homemade filters or regular sunglasses won't cut it). The American Astronomical Society has a list of reputable vendors of solar filters and viewers.
3. Always inspect your solar filter before use. Scratched or damaged? Throw it out. Also, be sure to read and follow any included instructions.
4. Always supervise children using solar filters.
5. Put on the filters before looking at the sun. Likewise, remove them after you've looked away from the sun.
6. Unfiltered cameras, telescopes, binoculars or other devices won't protect your eyes from the sun. Talk to an expert before using a filter on these devices (which should be attached to the front of them).
7. If you're in the path of totality, you can remove your solar filter when the sun is totally covered. But as the sun reappears, replace your solar viewer if you want to look at the remaining partial phases.
8. If you wear eyeglasses, put your eclipse glasses over them.
9. If your eclipse glasses are compliant with the ISO 12312-2 safety standard, you can look at the sun as long as you want. Beware of fake eclipse glasses that have been for sale.
10. You can also view the partially eclipsed sun using pinhole projection (learn more at eclipse2017.nasa.gov/safety).