Thanks - I learned something today.

Looks like some bus companies treat their windows to block the UVA as well. Eg https://www.valleymetro.org/blog/2022/07/how-valley-metro-ke...

We need a little UVB everyday to maintain melanin (skin pigment) and skin thickness. If you work inside M-F and then go hard on the weekends outdoors, you will receive disproportionate damage from sunlight.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3427189/

https://www.who.int/news-room/questions-and-answers/item/rad...

If you are blocking UVB, you should be blocking UVA as well. The bus folks are doing some good thinking.

So travelling for hours on the sunny side of the bus won't do anything to protect our kids’ eyesight?