Final answer:
UV light affects the epidermis and dermis layers of the skin by damaging collagen fibers, accelerating aging, and increasing the risk of skin cancer.
Step-by-step explanation:
Changes caused by UV light from the sun or the normal aging process affect the epidermis and dermis layers of the skin. UV radiation can damage collagen fibers, leading to an acceleration of the aging process, which manifests as wrinkles, and increases the risk of skin cancer due to repeated exposure. When someone experiences sunburn, it indicates damage to the outer layer, or the epidermis, which can extend into the dermal layer if blisters occur. Exposure to UV light also leads to photo-aging, with symptoms such as premature wrinkling and brown discolorations of the skin, and can cause direct and indirect DNA damage that increases the risk of skin cancer.