What is also known as aging rays?

• A. UVB radiation
• B. Infrared radiation
• C. UVA radiation
• D. Visible light

Answer: (C)

Photoaging is driven by UVA radiation. Its longer wavelengths penetrate deep into the skin, reaching the dermis where collagen and elastin reside. This deep exposure stimulates the production of reactive oxygen species and activates enzymes that break down collagen, leading to wrinkles, loss of elasticity, and pigment changes over time. UVB, while responsible for sunburn andDNA damage in the epidermis, has a shorter wavelength and focuses more on acute effects rather than long-term aging. Infrared mainly contributes heat, and visible light is not ultraviolet. Because UVA penetrates deeply and is a major cause of the skin changes seen with aging, it’s the aging rays.