So, I came across two studies that made me question the use of UV-blocking contact lenses.

One indicates that the crystalline lens has cells that can synthesize vitamin D when UVB light touches it, and the presence of vitamin D in the eye helps prevent infections and diseases.

The other one claims that about 2% of UV-A rays can reach the retina, and this helps suppress melatonin, more so than blue light, helping us feel alert during the day.

So it made me think about contact lenses with UV protection and how they prevent us from receiving this part of the light spectrum. Maybe our eyes were meant to receive at least some amount of UV light, just like our skin.

UV-blocking lenses are relatively new and we don't know yet the implications of cutting off a part of the natural light from our eyes. It's kind of like sunscreens: we are only now learning about the importance of getting at least some UV light on the skin to produce vitamin D, nitric oxide, etc.

Of course, I'm talking about sensible UV light exposure. If someone is exposed to UV light too much, like on the beach, they should protect their eyes from it, no doubt.