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Examine the subject closely and describe what you see.
Photochromic sunglasses use lenses that darken on exposure to specific types of light, most commonly ultraviolet (UV) radiation. Once the light source is removed (for example by walking indoors), the lenses will gradually return to their clear state. Photochromic lenses may be made of glass, polycarbonate, or another plastic.
"Cubing" Method
Use any reasoning to argue for or against the subject.
Describe the subject's uses.
photochromic material
Break the subject into parts. Tell how it is made.
There are many uses for photochromic materials, some in industry some in retail