IGnaefLightweight Polarized Sunglasses for Women, UV400 Protection Anti Glare HD Sun Glasses

Do these glasses fit a small face frame? I have found that many glasses are loose on me and fall off.

I suffer with a lot of headaches in bright sunlight. How dark are thes glasses, would they block out most of the sun

What UV catergory of protection do these offer please? Instructions provide a chart but do not state which catergory these glasses correspond to.

Are the lenses dark so your eyes are not too visible?