L'Oréal Research and Innovation, France.
Indian J Dermatol Venereol Leprol. 2012 Jun;78 Suppl 1:S24-30. doi: 10.4103/0378-6323.97352.
Skin exposure to sunlight can cause many adverse effects. It is now recognized that both Ultraviolet A (UVA) and UVB wavelengths are responsible for the detrimental effects of solar radiation on skin. With our increasing knowledge on the harmful effects of UVA, the need for effective, well-balanced photoprotection has become more crucial. Numerous clinical studies showed that well-balanced sunscreen, with a SPF/UVAPF ratio ≤ 3, provide the most effective protection against pigmentation (especially on dark skin), DNA damage, UV-induced skin immunosuppression and photodermatoses. The calculation of UVA protection required in Asia revealed its particular importance in India, and gives clear evidence that the SPF value alone is not sufficient to evaluate the efficacy of a sunscreen.
皮肤暴露在阳光下会引起许多不良反应。现在人们已经认识到，紫外线 A（UVA）和 UVB 波长都会对皮肤造成太阳辐射的有害影响。随着我们对 UVA 有害影响的了解不断增加，对有效、均衡的光保护的需求变得更加重要。许多临床研究表明，具有均衡防晒系数（SPF）/UVA 防护因子（UVAPF）比值≤3 的防晒霜，可提供最有效的防护，防止色素沉着（尤其是在深色皮肤上）、DNA 损伤、UV 引起的皮肤免疫抑制和光致皮肤病。在亚洲进行的 UVA 防护计算突显了其在印度的重要性，并清楚地表明，仅 SPF 值不足以评估防晒霜的功效。
