Eclipse Safety 101 — ISO 12312-2 International Standard for Safe Solar Viewing
When watching a partial or annular solar eclipse directly with your eyes, you must look through safe solar viewing glasses (“eclipse glasses”) or a safe handheld solar viewer at all times. Eclipse glasses are NOT regular sunglasses; regular sunglasses, no matter how dark, are not safe for viewing the Sun. Safe solar viewers are thousands of times darker and ought to comply with the ISO 12312-2 international standard. NASA does not approve any particular brand of solar viewers.
Explore more eclipse safety tips and learn more about safe solar viewing: https://go.nasa.gov/EclipseSafety
WARNING: It is never safe to look directly at the Sun without specialized eye protection designed for solar viewing.