Optical eyeglasses yog tsom iav uas siv cov khoom siv kho qhov muag xws li lo ntsiab muag, prisms, qhov muag lo ntsiab muag, thiab cov khoom siv lo ntsiab muag los kho qhov muag, txo qhov muag, thiab tiv thaiv lossis kho qhov muag. Lawv suav nrog tsis tsuas yog cov tsom iav pom ze xwb tab sis kuj tsom iav qhov muag, tsom iav nyeem ntawv, tsom iav astigmatism, thiab tag nrho lwm cov iav siv los kho qhov tsis zoo, nrog rau qee cov iav tiv thaiv.
Optical eyeglasses siv lo ntsiab muag, prisms, hu rau lo ntsiab muag, thiab cov khoom siv lo ntsiab muag los kho qhov muag, txo qhov muag, thiab tiv thaiv lossis kho qhov muag. Muaj ntau hom tsom iav. Txhawm rau kho qhov yuam kev refractive, muaj cov tsom iav kho qhov muag thiab cov tsom iav. Txhawm rau kho qhov muag aphakic, ntxiv rau cov lo ntsiab muag, cov lo ntsiab muag tuaj yeem cog tau. Kuj tseem muaj ntau yam tsom iav tiv thaiv, tsom iav kom zoo nkauj, thiab kev pom kev pab kho qhov muag tsis pom kev. Tag nrho cov lo ntsiab muag yog lo ntsiab muag nyias, thiab lawv lub zog yog qhov sib txuam ntawm lub lens lub focal ntev (hauv meters).
