While higher SPFs block more of the sun’s UVB rays, no sunscreen can block 100% of the sun’s UVB rays. Learn everything you need to know about SPF including how long factor 50 lasts, how it works, and which number is best suited to your skin. What does the SPF number mean?
Most sunscreens say they offer UVA and UVB protection, but what does that mean, and what’s the difference between the two? According to the University of Iowa Hospitals & Clinics, “UVB rays are responsible for producing sunburn [and] also play the greatest role in causing skin cancers, in...
UV is most commonly found in sunlight and are classified as UVA, UVB or UVC rays which each cause different levels of harm. From what we know now UVA and UVB are the more damaging UV rays and are found to have caused melanoma, and other skin cancers, in the past....
A sunscreen may provide an SPF upwards of 50, but if it only offers UVB protection, your skin is still susceptible to UVA rays capable of causing sun damage and aging the complexion. Dr. Schlessinger explains, “What SPF is depends on how long you will be out in the sun and what sort...
What does the water content of a contact lens mean? Disclaimer: The advice in this article is for informational purposes only and does not replace medical care or an in-person check-up. Please check with an eyecare professional before purchasing any products or remedies. For information on our...
What does PA mean? You might also see the label “PA” on your sunscreen’s packaging. PA is short for the protection grade of UVA. It’s a Japanese rating system measuring the effectiveness of blocking UVA rays, while an SPF rating most specifically applies to UVB rays. The PA rating ...
UVB rays are the main culprit in sunburn and can also cause skin cancer.¹² Take the guesswork out of finding your next SPF with The Sunscreen by Curology, a mineral formula with SPF 30 designed by dermatologists for acne-prone skin (but great for all skin types). Made to work ...
SpO2 can be measured by pulse oximetry, an indirect, non-invasive method (meaning it does not involve the introduction of instruments into the body). It works by emitting and then absorbing a light wave passing through blood vessels (or capillaries) in the fingertip. A variation of the light...
UVA reaches us all day, every day as it passes through clouds. It also passes through glass, so being behind a window doesn’t protect you. You need to wearsunscreento guard against it effectively. While UVA on its own doesn’t result in sunburn, it does break down the collagen and el...
which can penetrate into the lower level of the skin, called thedermis. UVA rays are typically associated with “tanning.” However, the darker color of the skin is a sign of damage to cells in the dermis. SPF numbers typically refer only to UVB rays, but some sunscreens can protect agai...