Functional characteristic of roller shade fabric-UV blocking As we all know, when the ultraviolet rays in the sun irradiate the skin, it will cause certain damage to the skin. According to research, photodermatitis can occur when ultraviolet rays are severe, and erythema, itching, blisters, edema, etc. and even skin cancer. in addition, when ultraviolet rays in the sun act on the central nervous system, symptoms such as headache, dizziness, and increase of body temperature , the ultraviolet rays in the sun act on the eye can cause conjunctivitis and may also induce cataracts. Moreover, long-term direct sunlight will promote the accelerated aging and discoloration of furniture and furnishings.