Photochromic lenses also known as transition lenses darken to a sunglasses tint when exposed to sunlight, or UV ultraviolet, and return to a clear state when indoors, away from UV light. Often referred to as transitions or reactolights, photochromic lenses are made of many lens materials including plastic, glass or polycarbonate.

OPTICAL CLARITY: Glass has more optical clarity than plastic and offers little to no distortion. UV PROTECTION: Regular plastic eyeglass lenses block most UV light, but adding a UV-blocking dye boosts UV protection to 100 percent for added safety. LONGEVITY: Due to its construction, glass is more durable than optical plastic. Under UV light, the quantum dots in the wood emitted and scattered an orange light that spread evenly throughout the film's surface. The team demonstrated the ability of a luminescent panel to
A quick Google search on “UV window protection” indicates the answer is NO. With over 31,000 results, the first page is filled with UV-blocking films for sale that provide protection. That sun faded sofa at grandma’s house is a great visual reminder that UV does indeed pass through glass.
An increasingly important performance value for coated fabrics is ultraviolet (UV) light resistance. It is known that polyurethane and vinyl materials used for both interior and exterior applications are subject to photo-degradation when exposed to ultraviolet light. Photo-degradation is a process whereby the polymer chains in the product break
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does plastic block uv light