http___hr.265health.com_public-health-safety_work-safety_1016080923.html_1.xml
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Glass Lenses Glass prescription lenses still offer the best visual acuity of any eyeglass lens, as they have for hundreds of years. Glass lenses have less impurities in the material compared to plastic lenses, and so they are optically clearer and easier to see through. However, over 95% of prescription lenses nowadays are made from some kind of plastic because using glass lenses has some restrictions and drawbacks. No lens material is more clear, clean, or better functioning that a eyeglass lenses made from glass. Also, because glass is a much harder material than plastic, glass lenses do not scratch as easily as plastic lenses, even if they have scratch resistant coating. Now, here comes the bad news: Glass lenses are almost twice as heavy as plastic lenses, more expensive, and not as safe as plastic lenses. Glass lenses can only fit into eyeglass frames with a "B" measurement (vertical height) of at least 28mm, and glass lenses cannot be installed in rimless or semi rimless frames. Glass lenses take much longer than plastic lenses. You should allow two to three weeks for processing an order with glass lenses. Two weeks is the average processing time because every pair of glass lenses is “drop ball” tested before it leaves the lab. Occasionally, the lenses will fail the drop ball test, and they need to be discarded and started again. This could lead to additional delays.
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Zaštitne naočale mogu biti s recept leće za smještaj individualne potrebe . To omogućujeosobi da bude zaštićena , dok uživate u udobnosti ispravljena vizije . Staklene leće staklene leće može biti teška ipomalo nespretno , ali oni su također teže ispočetka , a može se koristiti u područjima gdje su prisutne kemikalije . Staklene leće također mogu biti skloni zamagljivanje , pa se oprez . Plastične leće Plastične leće su više lagani , manje je vjerojatno da magle i može se koristiti za zaštitu nositelja protiv rasipanja zavarivanja . Međutim , plastične leće mnogo lakše nego učiniti staklene leće ispočetka . Polikarbonat leće polikarbonatne leće su izuzetno lagan , manje je vjerojatno da se magla i daleko više utjecaja otporniji od bilo stakla ili plastične leće . Polikarbonatne leće mnogo lakše nego staklene leće ispočetka . Side Protection Zaštitne naočale stane oko lica i priložiti oči . Neki će imati rupe ili ventilacijske otvore na strani područja kako bi se omogućilo kretanje zraka . Ove vrste naočala ne može se nositi u svim područjima , što je potpuna kućište ponekad je poželjno . To može uključivati područja , gdje se kemikalije koriste , kao i nekim poljima zdravstvene zaštite . From:http://hr.265health.com/public-health-safety/work-safety/1016080923.html