During the partial phases
Use suitable solar viewers that comply with ISO 12312-2 and come from a trustworthy supplier. Ordinary sunglasses are not a substitute. Check viewers for damage before use and supervise children.
Cameras, binoculars and telescopes
These need appropriate solar filters secured to the front of the optics. Never look through unfiltered optics while wearing eclipse glasses: concentrated sunlight can damage the viewer and your eyes. Seek advice from an experienced solar-observing supplier.
The brief total phase
Only inside the path, while the Sun is completely covered, is direct viewing without a solar viewer appropriate. Replace protection before any bright part of the Sun reappears. At a partial-only location, protection stays on throughout.
Prepare in advance
Read the full NASA guidance, understand your local contact times and attend the viewing briefing. If you are unsure about the phase or your equipment, keep protection in place.