So what are the uv light receptors doing in the eye and the skin?

True, over exposure can be bad. My mom got Pterygium (benign tissue that grows from UV exposure) from playing too much golf without wearing a hat. Surfers get that too. Hats and sunglasses don’t make sense in the morning or afternoon, which is when you get the most impactful signals from the sunlight that keep your circadian rhythm in tune.

pssshhh as if you can defeat memes with qualifications and years is experience

It is bad, and becoming even worse.