Sun exposure from a young age can contribute to the development of eye disease later in life. Choosing the Right Pair of Sunglasses. While style and comfort play a big role in choosing the right pair of sunglasses, the right lenses also make a big difference. The first rule of thumb is to choose sunglasses that provide 100% UVA/UVB protection.
A light made for aquariums, as well as lights designed to grow plants, are not working. It reduces the efficiency of light because UVB rays cannot pass through glass. The same can be said for both plastic and plexiglas. If you want your iggy to get direct UVB lighting, make sure it is not blocked by anything. How Much Sun Should An Iguana Get? If so, UVA rays are coming to work with you. UVB rays, the primary sunburn ray, are largely blocked by glass; but more than 50 percent of UVA rays, the main cause of premature skin aging, can penetrate glass. (Both UVA and UVB rays contribute to the development of skin cancer.) While sunlight can pass through window glass, the UVB wavelengths in sunlight cannot, according to the NIH. Because you need UVB exposure to jump-start the vitamin D production process, sunlight that passes through a window cannot increase your vitamin D levels, even if it strikes bare skin.

For reference, 25 (OH)D is your serum biomarker (i.e., from a blood test) of vitamin D status in your entire body. So, the answer is no—you can't get vitamin D through a window. Ultimately, the question isn't even that consequential, considering experts agree we shouldn't be relying on sunlight as our sole source of vitamin D anyway.

While both UVA and UVB rays can harm the skin and lead to skin cancers, UVB is effectively blocked by glass. However, at least 50 percent of UVA radiation can pass through windows. (Car windows have been proven to let in more than 60 percent.)
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