Solar Viewing Glasses are necessary for safe direct viewing of the Sun and solar eclipses.
These glasses filter out 100% of harmful ultraviolet, 100% of harmful infrared, and 99.999% of intense visible light.
Partial or annular solar eclipses are different from total solar eclipses – there is no period of totality when the Moon completely blocks the Sun's bright face. Therefore, during partial or annular solar eclipses, it is never safe to look directly at the eclipse without proper eye protection.
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 comply with the ISO 12312-2 international standard.
Always inspect your eclipse glasses or handheld viewer before use to make sure they are not damaged.
Do NOT look at the Sun through a camera lens, telescope, binoculars, or any other optical device while wearing eclipse glasses or using a handheld solar viewer — the concentrated solar rays will burn through the filter and cause serious eye injury.