偏光鏡是根據光線的偏振原理制造。是利用偏振光的特性，以偏振鏡片把非金屬物體、水面等反光過濾消除的透鏡。偏振鏡可以消除反光及使色彩更鮮艷，一些電影甚至全片用偏振鏡拍攝，使畫面有更濃艷的色彩。當陽光投射在路面或水面上時，直接刺激眼睛，使眼睛感到眩目、疲勞、不能持久視物。特別是當您在駕駛汽車、進行戶外娛樂活動時，不僅影響我們的工作和娛樂情緒，甚至影響我們對物象的判斷力而造成危險；長期經受陽光的直接照射，還會導致視力的急速下降，形成近視、遠視、散光或白內障等。這時候偏光鏡的作用就體現了。

偏(pian)(pian)(pian)光(guang)(guang)(guang)(guang)鏡(jing)(jing)(jing)片是(shi)采用(yong)和隱(yin)形眼(yan)(yan)(yan)鏡(jing)(jing)(jing)一樣輕(qing)巧精(jing)密的(de)(de)(de)(de)合成樹脂制(zhi)成，制(zhi)成后，可(ke)濾去(qu)因水(shui)面(mian)(mian)潮濕或陽(yang)(yang)(yang)光(guang)(guang)(guang)(guang)照射下的(de)(de)(de)(de)馬(ma)路反光(guang)(guang)(guang)(guang)。主要優點：輕(qing)，能(neng)濾去(qu)99%刺眼(yan)(yan)(yan)的(de)(de)(de)(de)反射亂光(guang)(guang)(guang)(guang)，99%的(de)(de)(de)(de)有害(hai)紫外(wai)光(guang)(guang)(guang)(guang)，不(bu)易碎。為了過濾太(tai)陽(yang)(yang)(yang)照在水(shui)面(mian)(mian)、陸(lu)地或雪(xue)地上的(de)(de)(de)(de)平等方向的(de)(de)(de)(de)刺眼(yan)(yan)(yan)光(guang)(guang)(guang)(guang)線(xian)(xian)，在鏡(jing)(jing)(jing)片上加(jia)入垂直向的(de)(de)(de)(de)特(te)殊涂料，就稱(cheng)為偏(pian)(pian)(pian)光(guang)(guang)(guang)(guang)鏡(jing)(jing)(jing)片。最適合戶外(wai)運(yun)動（例如：駕駛、海上活動、滑雪(xue)或釣(diao)魚）時使用(yong)。所(suo)以偏(pian)(pian)(pian)光(guang)(guang)(guang)(guang)太(tai)陽(yang)(yang)(yang)鏡(jing)(jing)(jing)可(ke)根據用(yong)途一般(ban)可(ke)以分為：滑雪(xue)鏡(jing)(jing)(jing)，釣(diao)魚鏡(jing)(jing)(jing)，偏(pian)(pian)(pian)光(guang)(guang)(guang)(guang)駕駛鏡(jing)(jing)(jing)，戶外(wai)運(yun)動鏡(jing)(jing)(jing)，高(gao)爾夫眼(yan)(yan)(yan)鏡(jing)(jing)(jing)。由于偏(pian)(pian)(pian)光(guang)(guang)(guang)(guang)太(tai)陽(yang)(yang)(yang)鏡(jing)(jing)(jing)的(de)(de)(de)(de)首要功能(neng)是(shi)防紫外(wai)線(xian)(xian)和過濾偏(pian)(pian)(pian)振(zhen)光(guang)(guang)(guang)(guang)，好(hao)的(de)(de)(de)(de)偏(pian)(pian)(pian)光(guang)(guang)(guang)(guang)太(tai)陽(yang)(yang)(yang)鏡(jing)(jing)(jing)鏡(jing)(jing)(jing)片可(ke)以阻擋90%以上紫外(wai)線(xian)(xian)的(de)(de)(de)(de)穿透，請選擇帶有“UV400”最佳阻隔紫外(wai)線(xian)(xian)標識的(de)(de)(de)(de)偏(pian)(pian)(pian)光(guang)(guang)(guang)(guang)太(tai)陽(yang)(yang)(yang)鏡(jing)(jing)(jing)；如果佩戴了不(bu)能(neng)阻擋紫外(wai)線(xian)(xian)和偏(pian)(pian)(pian)振(zhen)濾光(guang)(guang)(guang)(guang)功能(neng)的(de)(de)(de)(de)劣質偏(pian)(pian)(pian)光(guang)(guang)(guang)(guang)太(tai)陽(yang)(yang)(yang)鏡(jing)(jing)(jing)，比(bi)如深色的(de)(de)(de)(de)太(tai)陽(yang)(yang)(yang)鏡(jing)(jing)(jing)，隨(sui)著進(jin)入人眼(yan)(yan)(yan)的(de)(de)(de)(de)光(guang)(guang)(guang)(guang)線(xian)(xian)變暗，人眼(yan)(yan)(yan)的(de)(de)(de)(de)瞳孔會變大，則進(jin)入眼(yan)(yan)(yan)睛的(de)(de)(de)(de)紫外(wai)線(xian)(xian)增(zeng)加(jia)，增(zeng)加(jia)對人眼(yan)(yan)(yan)的(de)(de)(de)(de)傷(shang)害(hai)。