Thaum lub lens zoo li no tau tsim, qee cov hlau oxides xws li hlau, pob zeb diamond, chromium, strontium, npib tsib xee, manganese thiab qee lub ntiaj teb tsis tshua muaj hlau oxides xws li neodymium ntxiv rau cov qauv kho qhov muag pom. Cov hlau oxides no tso cai rau lub iav kom xaiv cov khoom nqus hluav taws xob tsis zoo nyob rau hauv ib qho ntawm lub teeb. Piv txwv li, oxides ntawm cerium thiab hlau tuaj yeem nqus tau ntau ntawm ultraviolet rays. Kev siv lub iav lo ntsiab muag no tuaj yeem txo cov nqi ntawm qee qhov wavelengths dhau los ntawm lub lens thiab txo lossis tiv thaiv kev puas tsuaj rau lub qhov muag. Cov xim sib txawv ntawm cov lo ntsiab muag tiv thaiv tuaj yeem nqus lub teeb ntawm cov xim sib txawv. Cov iav zoo li no tau muab faib ua ob pawg, ib qho yog hom kev nqus, lwm yam yog hom kev xav, qhov qub yog siv ntau tshaj.
Lenses feem ntau yog puag ncig, thiab cov lus qhia tshwj xeeb tau qhia los ntawm lawv txoj kab uas hla hauv mm, suav nrog φ48, φ50, φ52, φ56, φ60, φ65, φ70, thiab lwm yam. Cov kev qhia tshwj xeeb tshaj plaws yog φ56, φ60, thiab φ65. Vim qhov muaj koob meej ntawm cov thav ntawv loj, kev siv cov lo ntsiab muag loj xws li φ70 tau nce.
