What is an SPF rating?
Are jane iredale sunscreen products water resistant?
What's the difference between a sunscreen and a sunblock?
Which are the most damaging rays?
UVB rays were once thought to be the culprits because they penetrate and affect the epidermis, but UVA rays are now known to be equally if not more damaging. According to Dr. Madhu A. Pathak at the Harvard Medical School; 'Many lines of evidence indicate that the primary biological actions of UVA radiation involve DNA damage'. UVB emissions from the sun undergo significant seasonal variations; the UVA emissions, however, do not appreciably change over the course of the year. The amount of solar UVA reaching the earth's surface is much greater than that of UVB. Also, UVA is transmitted by most window glass and many plastics that do not transmit UVB. Always check to make sure your sunscreen protects from UVB and UVA, but be aware that regardless of the advertising no sunscreen product screens out all UV rays. The best defence is to try to minimize your exposure between the hours of 10 a.m. and 3 p.m. The effects of infra-red rays (felt by the body as heat) are not fully known, but according to Drs. Lorraine and Albert Kligman from the University of Pennsylvania; 'They cannot be ignored in connection with photoaeging'.
Can sun damage be reversed?
We are told that some of it can be if, and only if, the skin is always protected from the sun. The excellent skin care products on the market today can substantially aid the skin in reversing sun damage. But they do no good if they aren't combined with sun protection. Months of hard work can be undone in one morning working in the garden with no sunscreen, hat or gloves on.
What are some of the effects of sun exposure?
Lines, wrinkles and sagging are the direct result of sun damage to the underlying collagen and elastin fibers. Hyperpigmentation can be caused or exacerbated by sun irritation to the melanocytes, which in turn causes over-production of melanin, which is in fact the body's attempt to protect itself. Add in hypopigmented macules, telangiectasias and raised, roughed precancerous actinic keratoses and the result of tanning is not pretty.
Is there such a thing as a safe tan?
No! A tan is a sign of injury. It is the body's attempt to increase sun protection after the skin is already permanently damaged by an overdose of ultraviolet radiation! 80% of the visible signs of ageing is due to sun exposure. And that means all sun exposure, because radiation is cumulative. Walking to the mailbox, getting in your car, and sitting by the window all count! Unprotected exposure to the sun is like sitting in a time machine on fast-forward.