隱形眼鏡與放大片是氧氣傳達角膜的一道屏障,透氧率就是衡量這道屏障的指標,數值越大即代表越透氧。它是氧氣通過隱形眼鏡的擴散係數D(Diffusivity) 及溶解係數k(Solubility)的乘積,因此透氧率是由鏡片「材質」決定,與鏡片的幾何形狀或弧度設計無關。
水膠鏡片主要由鏡片中的水分子傳遞氧氣,因此含水量高透氧率也高。但即使鏡片含水量達99%,透氧率仍不會超過理論值約40。矽水膠鏡片雖然也含水,但傳遞氧氣機制不是依賴水分子,而是由「矽」分子所鍵結的聚合物所主導。矽分子透氧率理論值可達100以上,因此矽水膠鏡片透氧率遠高於只依賴水分子的水膠鏡片。
相較透氧率,傳氧率多考量「t」值(鏡片厚度),即同時與鏡片材質及鏡片幾何設計相關。以近視鏡片而言,厚度取值在最薄的中央光學區,取調和平均值,但由於不同度數的鏡片厚度不同,一般以300度為基準。(一般軟式鏡片中央光學區厚度約莫0.07~0.10mm之間。)
理想上只要將隱形眼鏡鏡片設計得非常薄,即便材質透氧率低也能大幅提高傳氧率,但若考量鏡片的光學性、物理性、生產良率、使用性等因素,厚度太薄反而衍生更多的問題。
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BenQ Materials ("BenQ Materials," "we" or "our") uses cookies on our websites to create the most effective website possible for you. This Cookie Policy explains what cookies are, how we use them on our websites, what benefits they bring, as well as your right to control their use. This Policy forms part of the BenQ Materials Privacy Policy
Page updated: December 2020
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美若康公司(以下簡稱本公司)作為處理您個人資料之控制者,因此本公司將依循歐盟一般資料保護規則(General Data Protection Regulation;簡稱GDPR)處理與保護您的個人資料,請詳閱下列告知事項: