1. Npaj cov kua nplaum, cov ntaub ntawv lossis cov ntawv xuab zeb. Ntxuav qhov chaw tawg thiab siv cov ntawv xuab zeb los yog cov ntaub ntawv kom du ntawm qhov tawg. Lub thickness feem ntau yog 2-3 hli. Smoothing nws tawm yuav ua rau kev sib raug zoo tom qab.
2. Yog tias qhov tawg ntawm lub thav duab yog ze rau ntawm lub lens, lub lens yuav tsum tau muab tshem tawm. Yog tias nws nyob deb, tsis tas yuav tshem lub lens. Nws yog qhov zoo tshaj kom tsis txhob tshem tawm yog tias ua tau.
3. Siv cov kua nplaum tsim nyog rau ntawm qhov chaw tawg, feem ntau qhov loj ntawm cov nplej nplej yog txaus rau ib lub sijhawm. Tom qab ua ntawv thov, nplaum ob sab ua ke thiab nias maj mam. Cov kua nplaum yuav qhuav li ntawm 30 feeb.
4. Tom qab ntawd siv cov kua nplaum los khi rau txoj haujlwm luv luv ob mus rau peb zaug. Tos kom cov kua nplaum kom qhuav thiab sim dua kom pom tias qhov tawg ntawm qhov kev sim thav duab tsis muaj zog dua. Lub zog tsim nyog yog qhov zoo tshaj plaws.
