I use mineral sunscreen (zinc oxide) on my face if I’ll be outside for longer than 20 minutes. There are no chemicals in it at all. It is greasy and it makes my face temporarily whiteish, but it is worth it to prevent burning, freckles, wrinkles and especially cancer.
I have family members that don’t burn and still get cancer. I think the Vitamin D conversation is interesting. The eye thing sounds pretty legit to me. But if my choices were getting Vitamin D from the sun only and possibly getting cancer, or using a good supplement and making sure to eat fat from grass fed animals to get dietary Vitamin D, I’d choose the latter. Chemo and radiation are certainly worse than swallowing capsules and feeling like I’m not being “natural” enough.
I also agree with covering up in the sun and I highly recommend researching astaxanthin and sun.