Lub iav tsom iav yog lub lens convex siv los nthuav cov khoom, tus qauv ntawm lub tshuab tsom. Nws feem ntau yog siv los soj ntsuam cov ntsiab lus ntawm cov khoom. Magnifying tsom iav yog converging lo ntsiab muag nrog ib tug me me focal ntev tshaj qhov photopic deb ntawm lub qhov muag. Cov iav tsom iav tuaj yeem raug cais raws li qhov pom, uas tuaj yeem muab faib ua cov iav tsom iav portable, tsom iav hom tsom iav thiab tsom iav ntsug. Raws li kev faib tawm ntawm pawg neeg siv, nws tuaj yeem muab faib ua cov iav tsom iav rau cov neeg laus, iav tsom iav rau cov menyuam yaus, sab nraum zoov portable magnifying iav, kev ntsuas kev ntsuas ntsuas iav thiab cov iav tsom iav kho mob.
Desktop magnifying iav tuaj yeem kho tau, muaj lub hauv paus hauv qab, lub iav tsom iav saum toj no, cov duab ntawm lub iav tsom iav tuaj yeem ua plaub fab lossis square, los yog puag ncig, xws li iav magnifying yog tsuas yog siv rau lub sijhawm ntev saib ntawm qhov chaw. Desktop magnifiers tuaj yeem muaj caj npab ntev thiab khoov qhov chaw, thiab tuaj yeem hloov pauv raws li qhov xav tau. Portable magnifying iav yog zoo li saum toj no, ib puag ncig lub iav nyob rau hauv pem hauv ntej ntawm ib tug kov, muaj ntau hom portable magnifying iav, ib co magnifying iav yog square, rectangular los yog round, kuj muaj magnifying iav los yog folding magnifying iav uas yuav tsum tau ua ke, xws li lub iav magnifying yog tsuas yog yooj yim los khi thiab nqa, yooj yim rau kev soj ntsuam.
Portable magnifiers kuj muaj nrog thiab tsis muaj teeb pom kev zoo, thiab muaj ntau yam txiaj ntsig thaum saib nrog lub teeb magnifiers. 1. Handheld magnifying iav Handheld magnifying iav yog me me thiab lub teeb yuag, pheej yig, nqa tau yooj yim, thiab muaj zog siv tau. Muaj ntau hom iav tsom iav, uas yog puag ncig thiab square hauv cov duab; Los ntawm cov qauv, muaj hom kov, folding hom thiab built-in lub teeb qhov chaw hom.