1. What exactly do we protect from the sun?
Sunlight is divided into different wavelengths according to the length of wavelengths, among which, the one closely related to skin darkening, spotting and wrinkling are ultraviolet.
UV rays are divided into different wavelengths according to different wavelengths and penetration, they can be divided into short-wave ultraviolet (UVC), medium-wave ultraviolet (UVB), and long-wave ultraviolet (UVA).
What is the difference between the effects of these three types of UV rays on the skin?
Short-wave UVB generally rarely reaches the ground and can cause negligible damage to our skin.
Medium-wave UVB generally only reaches the superficial layers of the epidermis and dermis of the skin, causing sunburn, sun damage, and tanning, resulting in age spots, sun spots, and aggravated melasma.
Long-wave ultraviolet rays can generally act on the superficial middle layer of the dermis, mainly causing the denaturation of elastic fibers in the dermis, resulting in skin relaxation and wrinkles.
Therefore, in order to maintain fair skin and delay the appearance of skin discoloration, wrinkles, and other aging phenomena, the latter two types of UV rays, directly determines the composition and coefficient used in sunscreen.
2. Sunscreen is only the most basic way of sun protection
In fact, sunscreen is only one of the ways to protect yourself from the sun, and it is the most ineffective one.
There are generally 3 ways to protect yourself from the sun.
The first and most effective one is to avoid the sun, remember, avoiding the sun is the most effective way. If you can’t avoid it, we should avoid going out at around two o’clock in the afternoon, when the sun is at its heaviest during the day.
The second, when you need to go out, we can play umbrella, wear a jacket to shade, to avoid the sun directly to the skin.
The third and most basic move is our sunscreen. Many people will mistakenly think that sunscreen is only needed when going out, in fact, more accurately, it is also a protective umbrella for us in the shade, indoors. Due to the refraction and scattering of sunlight, whether outdoors or indoors, there will still be a portion of UV rays on our skin, so sunscreen should be as our basic program is always ready.