According to the NASA, it is not safe to look at the sun directly through any optical device without a filter, such as a camera lens, telescope, or binoculars, even if you are wearing eclipse glasses or a portable solar viewer. The suns rays can still burn through the filter of the glasses or viewer, given how concentrated they can be through an optical device, and can cause serious eye damage. However, it is possible to use welding filters to view the eclipse safely because the international safety standard was partially derived from the use of such filters to view the sun. These filters are not usually found on store shelves, but they may be available online. Adjustable or auto-darkening welding helmets are not recommended because they may not darken quickly enough to view the sun safely.

Positive:

• It is possible to use welding filters to view the eclipse safely.

Negative:

• It is not safe to look at the sun directly through any optical device without a filter.

Ingredients or materials:

• Welding filters.