我们邀请了两位皮肤科专家为我们解释了一下防晒霜的效果可以持续多久,以及正确地重新使用防晒霜的方法。以下是他们给出的最好的建议:
Your sunscreen SPF is only 100 percent guaranteed for two hours after you put it on
在你涂上防晒霜之后,它的防晒效果只能完全保护你两个小时
"When we talk about reapplying sunscreen every two hours, that number comes from how SPF is tested," John Zampella, a dermatologist at NYU Langone Health, said.
“当我们谈到每两个小时重新涂一次防晒霜的时候,这个数据是基于防晒指数的测试方法而定的,”纽约大学兰贡健康中心的皮肤科专家约翰·赞姆佩拉说道。
He explained that SPF numbers are based on how much protection a certain sunscreen will give you against the sun for two hours.
他解释道,防晒指数是基于防晒霜在两个小时中会给你提供何种程度的保护而确定的。
When you're active and enjoying the sun, like at the beach or a ballgame, it's important to reapply after that.
当你积极地享受阳光的时候,例如在海滩上或球类活动中,两个小时之后重新涂上防晒霜是很重要的。
If you put on an SPF of 50 at 10 a.m., by noon, "you're probably still getting some protection, but your SPF 50 is no longer accurate," Zampella said. "Maybe you're getting SPF 10 at that point."
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