UV is a cause of cataracts. I lived in Colorado for 25 years and rarely wore sunglasses. I'm in my 50's now and I had my right eye lens replaced with an implant at age 51, and my left eye lens replaced at age 53. It's miraculous surgery. The structure of my eye is essentially intact, just with intra-ocular lenses (IOL) inserted into my lens sacs, and I see great.
There is one more surgical step I do not want to take, and that is the Nd:YAG laser, which is used to blow a hole in the back of the lens sac when it becomes cloudy. Check out he videos. That's a destruction of the eye's structure that I am not willing to subject myself to for a fleeting glimpse of a planetary event.
I'll be watching the eclipse using the pin-hole-in-paper method, and reveling in the darkness.
Not gonna use eclipse glasses, welding visors, not even going to glance at the sun. I don't need it.