Keep on truckin' Jun 06 2012
The New England Journal of Medicine recently reported on the 69 year-old man in the photo above. Constant sun exposure to one side of his face resulted in premature aging, though, the other side doesn't look too bad for 69. The condition is called unilateral dermatoheliosis, which I think is Greek for make sure to wear sunblock.
The patient reported that he had driven a delivery truck for 28 years. Ultraviolet A (UVA) rays transmit through window glass, penetrating the epidermis and upper layers of dermis. Chronic UVA exposure can result in thickening of the epidermis and stratum corneum, as well as destruction of elastic fibers. This photoaging effect of UVA is contrasted with photocarcinogenesis.