blood is 80% water...UV light enters through our eyes and is through the skin too. Although the amount varies based on our diet. This UV light will kill viruses/bacteria INside our body.
* Who told you our body / eyes doesn't absorb UV?
Google - DIET SUNBURN or I can provide appropriate links.
To learn more about how diet affects affinity to sunburn / eye degeneration / eye fogging (Cataracts). It has to do with the level of metals in our body - IRON, ZINC, COBALT (Vitamin B-12), CHROMIUM, etc......also heme iron vs non-heme iron.
The primary ingredient in sunscreen is TITANIUM DIOXIDE, or sometimes IRON Oxide, or Zinc Oxide...google - how sunscreen works.
Guess what..the level of metals inside our body inhibits / reflects UV light / absorption and then causes our skin to heat up from the inside out! Burn!
Simple "science" -- but from - inside out thinking...
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Wearing lighter fabrics / lighter colored clothing as well to allow more UV light...but if that is impractical, then start with the eyes...or rather start with shedding the "eye protection" we have been CONned into buying...
Also another reason to GO OUTSIDE or open home/car windows, as UV light is blocked by windows as well...unless you have a special kind of window, which is pretty rare. We're sold on the idea that tinted windows are good for us....
Only if someone is at altitude climbing / hiking (10,000 ft+) for a sustained period might there be a concern, but again, a proper diet will solve this problem too....but that is another story.