I had a detached retina in my left eye 30 years ago, and have had all of the photocoagulation treatments that a pair of eyeballs can handle...
I completely understand what you're trying to do.
When I'm on my Can Am Spyder: I ride with a helmet that has a drop-down inside tinted visor, and I added a 2" wide strip of 95% sun-blocking film across the top of the outer visor for good measure.
I could probably use the setup for an afternoon of arc-welding!