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防曬spf愈高愈好?

防曬乳都有列明是spf多少, 方間有spf10-150都有, 是否spf愈高愈有效防曬?

By BarryMa  (middle-school student) on 2012-05-29  Answers 3   Views 143

i can answer

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By Birdy (pupil) on 2012-05-30

UVA 是形成皮膚老化、皺紋、失去彈性、黑色素沉澱、曬傷等的主要原兇。所以揀防曬都要搵d有防禦 UVA 的產品,其中主要分為 PA+、PA++ 及 PA+++ 三種,愈多+號防禦能力就愈高。大家要視乎活動性質來選購防曬產品的係數,千萬不要盲目地認為係數愈高愈好,這樣反而會增加皮膚負擔!

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By Bee (pupil) on 2012-05-30

咁阻隔到所紫外線, 係咪就可以阻隔到UVB?

講開UVB, 成日聽到人地講UVA, UVA又係乜嘢? UVA同UVB有乜分別?

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By Anonymous on 2012-05-30

SPF 其實為 Sun Protection Factor 的縮寫,中文可解作防禦指數,是表示防禦 UVB 能力的指標,紫外線的 UVB 主要會使皮膚角質增厚、暗沈、變紅、發痛及變乾等。

愈高的SPF值,可延長曬紅時間,但亦不代表能完全阻隔所有紫外線。

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