I'm heading to the Wind Rivers on August 21st for the full eclipse but want to protect my eyes from permanent damage. I have a pair of Julbo Explorer Glacier Sunglasses which are said to have 100% UV protection and block 95% of visible light. Despite how dark it feels wearing them, I'm mostly concerned about invisible rays. I'm leaning on not using them but am curious what others think. I've heard that there are ultra light eclipse glasses that are cheap.
Don't use them. Not dark enough. I read the shade protection needs to equal #13 on welders lens. I bought a handful of eclipse glasses at walmart for a buck a piece that have the ISO direct sun rating. You should not be able to see any natural light when looking thru them.
Like nickmech says... if you have the correct glasses when you put them on it is total blackness unless you look directly at the sun. If you can see through your glacier glasses then they are not dark enough.