<h3><span style="white-space: normal; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;">有太多的初级读者不是很清楚，也不愿意去花时间了解太多的基础问题，比如VUA和UVB的区别这种防晒的基础问题。 为了让更多的小白对防晒基础有了解。特意写了这篇文章来讲解</span><span class="wp_keywordlink_affiliate" style="white-space: normal; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;"><a href="https://www.truebuty.com/uva-defence.html" title="UVA" target="_blank" style="color: rgb(65, 168, 142); text-decoration: underline; transition: color 0.25s, background-color 0.25s; background-position: 0px 0px;">UVA</a></span><span style="white-space: normal; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;">和UVB的区别，以及如何应用于防晒产品的选择。</span><br></h3> <h2 style="white-space: normal; font-family: "Microsoft Yahei"; line-height: 18px; color: rgb(85, 85, 85); margin: 15px -10px; font-size: 16px; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(238, 238, 238); padding-bottom: 10px; padding-left: 10px; border-left-style: none; caret-color: rgb(85, 85, 85); text-align: justify; -webkit-text-size-adjust: 100%;">UVA和UVB的区别之一：波长不一样（根本区别)</h2><p style="white-space: normal; margin-bottom: 15px; word-wrap: break-word; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;">UVA和UVB都是阳光中的紫外线，紫外线对的人肉眼是不可见的（如果可见了，那就叫可见光了）。从物理学意义上来讲，是紫外线和可见光是由于光的波长不同的原因。如下图所示。UVB和UVA的对比可看出，UVA的波长较长， 而UVB波长较短。正是这个根本的不同，造就了UVA和UVB之间其它的不同。</h3> <h2 style="white-space: normal; font-family: "Microsoft Yahei"; line-height: 18px; color: rgb(85, 85, 85); margin: 15px -10px; font-size: 16px; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(238, 238, 238); padding-bottom: 10px; padding-left: 10px; border-left-style: none; caret-color: rgb(85, 85, 85); text-align: justify; -webkit-text-size-adjust: 100%;">UVA和UVB的区别之二：穿透力不一样</h2><p style="white-space: normal; margin-bottom: 15px; word-wrap: break-word; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;">阳光穿透地球大气层，其中的很大一部分UVB被大气层阻拦住了，但UVA比UVB的穿透能力强，因而紫外线中90%以上是UVA。而UVB甚至不易透过玻璃！</h3><p style="white-space: normal; margin-bottom: 15px; word-wrap: break-word; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;">与此类似，<span style="font-weight: 700;">紫外线照射到皮肤上也会有不同的穿透力</span>：UVB能到达皮肤表皮层，而UVA能达到皮肤真皮层。</h3> <h2 style="white-space: normal; font-family: "Microsoft Yahei"; line-height: 18px; color: rgb(85, 85, 85); margin: 15px -10px; font-size: 16px; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(238, 238, 238); padding-bottom: 10px; padding-left: 10px; border-left-style: none; caret-color: rgb(85, 85, 85); text-align: justify; -webkit-text-size-adjust: 100%;">UVA和UVB的区别之二：对皮肤的损伤不一样</h2><p style="white-space: normal; margin-bottom: 15px; word-wrap: break-word; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;">根据区别2我们知道UVA穿透能力强，但UVB也不容易忽视，因为其带的能量高，(UVB)对皮肤的损伤也很大。下面分别来看这两种紫外线的对皮肤的伤害：</h3><p style="white-space: normal; margin-bottom: 15px; word-wrap: break-word; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;"><span style="font-weight: 700;">UVA对皮肤的伤害</span>：</h3><ul style="white-space: normal; margin-bottom: 20px; margin-left: 20px; list-style-position: initial; list-style-image: initial; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;"><li style="margin-bottom: 6px;">短期的伤害包括黑色素沉积，肤色变黑，产生色斑等。记住”A” 与,“黑”的拼间韵母都是”ei”，跟着念ei hei， 就能记住哪个是让你的皮肤变黑的紫外线了。</li><li style="margin-bottom: 6px;">长期伤害：由于UVA能够穿透到真皮层，损伤细胞DNA, 胶原损伤，加速皮肤老化，甚至能引起皮肤癌。</li></ul><p style="white-space: normal; margin-bottom: 15px; word-wrap: break-word; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;"><span style="font-weight: 700;">UVB对皮肤的伤害：</span></h3><ul style="white-space: normal; margin-bottom: 20px; margin-left: 20px; list-style-position: initial; list-style-image: initial; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;"><li style="margin-bottom: 6px;">短期：晒伤，红斑，水肿，痛甚至水泡这都是UVB的对皮肤的短期伤害</li><li style="margin-bottom: 6px;">长期损伤也会损伤细胞DNA.</li></ul> <h2 style="white-space: normal; font-family: "Microsoft Yahei"; line-height: 18px; color: rgb(85, 85, 85); margin: 15px -10px; font-size: 16px; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(238, 238, 238); padding-bottom: 10px; padding-left: 10px; border-left-style: none; caret-color: rgb(85, 85, 85); text-align: justify; -webkit-text-size-adjust: 100%;">UVA和UVB的区别之三：防晒产品的标识不一样</h2><h2 style="white-space: normal; font-family: "Microsoft Yahei"; line-height: 18px; color: rgb(85, 85, 85); margin: 15px -10px; font-size: 16px; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(238, 238, 238); padding-bottom: 10px; padding-left: 10px; border-left-style: none; caret-color: rgb(85, 85, 85); text-align: justify; -webkit-text-size-adjust: 100%;"><p style="margin-bottom: 15px; word-wrap: break-word; font-size: 15px;">这里进入了具体防晒产品选择阶段，多年前，学界还没有认识到UVA也会对皮肤产生危害。因而当时的防晒产品只注重防UVB。国际通用的在化妆品产品中的标识是<span class="wp_keywordlink_affiliate"><a href="https://www.truebuty.com/spf-pa.html" title="spf" style="color: rgb(65, 168, 142); text-decoration: underline; transition: color 0.25s, background-color 0.25s; background-position: 0px 0px;">spf</a></span>值。但其后发现了UVA对皮肤的伤害后，相关的防UVA紫外线的<span class="wp_keywordlink_affiliate"><a href="https://www.truebuty.com/uv-filters.html" title="18种防晒剂大全" target="_blank" style="color: rgb(65, 168, 142); text-decoration: underline; transition: color 0.25s, background-color 0.25s; background-position: 0px 0px;">防晒剂</a></span>及产品才慢慢开发出来。目前我们国家所使用的是<span class="wp_keywordlink_affiliate"><a href="https://www.truebuty.com/spf-pa.html" title="pa" style="color: rgb(65, 168, 142); text-decoration: underline; transition: color 0.25s, background-color 0.25s; background-position: 0px 0px;">PA</a></span>值。分别以PA+,PA++,<span class="wp_keywordlink_affiliate"><a href="https://www.truebuty.com/spf30-pa3.html" title="PA+++" target="_blank" style="color: rgb(65, 168, 142); text-decoration: underline; transition: color 0.25s, background-color 0.25s; background-position: 0px 0px;">PA+++</a></span>来表示防UVA的能力。但其它国家和地区不一定是用PA值来标注防UVA的能力，比如欧洲用PPD后面接数值表示防紫外线UVA的能力。</h3></h2> <h2 style="white-space: normal; font-family: "Microsoft Yahei"; line-height: 18px; color: rgb(85, 85, 85); margin: 15px -10px; font-size: 16px; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(238, 238, 238); padding-bottom: 10px; padding-left: 10px; border-left-style: none; caret-color: rgb(85, 85, 85); text-align: justify; -webkit-text-size-adjust: 100%;">UVA，UVB与UVC的区别：要不要防UVC？</h2><p style="white-space: normal; margin-bottom: 15px; word-wrap: break-word; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;">其实紫外线除了UVB和UVA之外，还有UVC段的紫外线，但这部分紫外线被大气层挡住了。因而在地表也就不必要去防护了。</h3> <h2 style="white-space: normal; font-family: "Microsoft Yahei"; line-height: 18px; color: rgb(85, 85, 85); margin: 15px -10px; font-size: 16px; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(238, 238, 238); padding-bottom: 10px; padding-left: 10px; border-left-style: none; caret-color: rgb(85, 85, 85); text-align: justify; -webkit-text-size-adjust: 100%;">UVA/UVB的总结：</h2><p style="white-space: normal; margin-bottom: 15px; word-wrap: break-word; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;">肌肤老化、开始松弛、出现细纹，肌肤的水分流失，胶原蛋白流失都与紫外线有着直接的联系。而紫外线引起色斑（<span class="wp_keywordlink_affiliate"><a href="https://www.truebuty.com/rongyi-shaihei.html" title="晒黑" target="_blank" style="color: rgb(65, 168, 142); text-decoration: underline; transition: color 0.25s, background-color 0.25s; background-position: 0px 0px;">晒黑</a></span>），更是使你变黑的首要影响因素。对于UVA和UVB的区别，我们要记住</h3><p style="white-space: normal; margin-bottom: 15px; word-wrap: break-word; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;">1.UVA对穿透至皮肤真皮层，使皮肤晒黑</h3><p style="white-space: normal; margin-bottom: 15px; word-wrap: break-word; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;">2.UVB使皮肤晒伤</h3><p style="white-space: normal; margin-bottom: 15px; word-wrap: break-word; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;">3.防UVA的防护难度更大，因为其穿透力强，尽量选择高PA值的防晒产品，至少PA++,PA+++及以上更好</h3><p style="white-space: normal; margin-bottom: 15px; word-wrap: break-word; caret-color: rgb(85, 85, 85); color: rgb(85, 85, 85); font-family: "Microsoft Yahei"; font-size: 15px; text-align: justify; -webkit-text-size-adjust: 100%;">4.UVB虽然阳光中不多，但能量强，对皮肤伤害也大，国内防晒产吕使用SPF值标识，数值可标到<span class="wp_keywordlink_affiliate"><a href="https://www.truebuty.com/spf30-pa3.html" title="SPF30" target="_blank" style="color: rgb(65, 168, 142); text-decoration: underline; transition: color 0.25s, background-color 0.25s; background-position: 0px 0px;">SPF30</a></span>,超过SPF30, 比如SPF50也只能标SPF30+,而不能标SPF50. 夏季可考虑使用选择SPF30及SPF30+的防晒产品。<br>5.UVA和UVB的区别，最后用一张图表示，希望一定能够把它记住哦！</h3> <p style="font-family: -webkit-standard; 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