Recent research is defining photoaged skin as an entity distinct from chronologically aged
skin. Underlying the visible aspects of photoaging is connective tissue damaged by
excessive exposure to sunlight. The destructive wavebands include ultraviolet B (290 to 315
nm), ultraviolet A (315 to 400 nm) and infrared radiation (700 to 1 x 10 6 nm). In
experimental animals, photodamage is largely prevented by sunscreens with high sun
protection factors, and prior damage can be partially reversed. Repair of photodamaged …