Feem ntau ntawm kev puas qhov muag tsis pom kev, qhov phais (qhov tsis muaj zog) lossis hypermetropia (farsightedness) tau pom. Lub sijhawm ntawm tsom iav nyob rau hauv xws li anomalies yog aimed rau neutralizing lawv nrog kev pab ntawm scattering los yog sau tsom iav.
Yuav ua li cas los txiav txim rau lub diopter thaum xaiv glasses?
Thaum xaiv ntawm tsom iav tus neeg mob yog nyob rau ntawm ib tug deb ntawm 6 m los ntawm tag nrho cov paub tshwj xeeb lub rooj. Txhua qhov muag nyias muaj nyias kev soj ntsuam. Pib ntawm sab saum toj, tus neeg mob nyeem cov tsiaj ntawv ntawm txhua kab. Qhov kawg ntawm kab ntawv nyeem qhia pom tseeb tseeb. Tom qab ntawd, qaug zog (ntev tsom), thiab tom qab ntawd muaj zog (luv-tsom xam) convex iav yog siv rau qhov muag. Tus neeg mob nyeem dua zaum kawg, uas nws pom tau. Qhov muaj zog tshaj plaws hauv lub khob vis dis aus qhia tias qhov teeb meem ntawm farsightedness.
Yog tias qhov zeem muag tsis zoo los ntawm lub khob iav, ces daim ntawv pov thawj ntawm qhov pom tau tias yuav kis tau tus mob myopia. Qhov no yog ua tiav nrog kev pabcuam ntawm cov khoom iav. Yog hais tias lub iav tsis sib haum yog tsis pab, qhov ua rau ntawm qhov muag pom tseeb yog to taub ntxiv.
Hom kev iav nrog diopters
Muaj ntau hom tsom iav nrog diopters - tsom iav-chameleons (photochromic). Lawv siv cov thawv lo duab ntawm lub duab, xws li hloov xim, i.e. darken, nrog rau kev txiav txim ntawm ultraviolet sab. Nco ntsoov tias nyob rau hauv chav glazed cov chameleons tsis tsaus ntuj, vim cov iav silicate tsis cia ultraviolet dhau.
Qhov zoo tshaj plaws chameleon tsom iav qhov muag nyob rau hauv 3 feeb, tsaus ntuj rau 1 feeb. Hauv qhov no, lub lens yuav tsum hloov xim thaum tib lub sijhawm.
Cov iav thaiv kab mob kuj tseem tuaj yeem nrog cov diopters. Lawv siv cov kev ua si xws li kev ua si, kev caij tsheb kauj vab, lub cev muaj zog, kev ua si hauv roob, ntuj, thiab lwm yam. Lawv cov khoom yog tias lawv tau ua los ntawm cov ntaub ntawv ruaj ruaj, yog li cov iav thaiv lub qhov muag ntawm cov khoom tau los.
Cov tiv thaiv kev sib tw rau kev da dej nrog diopters tiv thaiv los ntawm UV hluav taws xob, thiab ib txheej tshwj xeeb ntawm sab hauv ntawm lub lens tiv thaiv lawv los ntawm kev dag. Thaum xaiv hom tsom iav, nws yuav tsum tau nyob rau hauv lub hlwb nco tias dej ua rau cov nyhuv ntawm lo ntsiab muag.
Cov tsom iav rau kev tsav tsheb nrog diopters, ntxiv rau kev kho qhov muag, yuav tsum xyuas kom tshem tawm cov tsho (polarization), tsim kom muaj kev sib txawv zoo. Cov tsom iav xws li tau ua nrog cov duab thaij duab.
Rau cov neeg uas tsis pom qhov muag, koj tuaj yeem xaiv lossis tsim kho lub iav looj tsom iav nrog diopters. Txhawm rau tshem tawm tsis pom kev zoo, koj yuav tsum xaiv cov qauv ntawm daim iav uas zoo li lub lauj kaub (yog li ntawd lub lens nyob hauv tib lub dav hlau nyob ntawm lub qhov muag).
Ntau thaum ua haujlwm ntawm lub computer siv computer tsom-iav, uas, ua tsaug rau cov ntxaij lim dej tshwj xeeb, txo cov lim ntawm qhov muag. Yog tias koj muaj teeb meem nrig, nws tuaj yeem ua ke xws li tsom iav nrog qhov muag lo ntsiab muag. Lwm qhov kev xaiv yog siv lub computer tsom iav nrog cov diopters tsim nyog.
Yog tias koj tuaj yeem tsis pom zoo, thiab qhov no ua rau lub qhov muag pom txawv txawv, tsom iav nrog cov diopters sib txawv.
Rau cov neeg feem coob tsis pom qhov muag, ob leeg coj ntawm tsom iav los ua - rau "nrug" thiab rau "nyob ze" (thaum nyeem ntawv). Tab sis nws muaj caij nyoog siv ib lub tsom iav nrog dioptries, ob qho tib si rau kev nyeem ntawv thiab lwm yam. Lo ntsiab muag hauv cov tsom iav yog hu ua multifocal.
Cov ntsiab lus muaj pes tsawg lub diopters (cov tsom iav coj mus muag) yog siv los ua ib qho khoom haum, xav txog cov duab.
Yog hais tias koj xav zam tsom iav nrog dioptries, thov nco ntsoov tias nyob rau hauv lub tom ntej lub caij nyob rau hauv lub zam yuav tsom iav "miv lub qhov muag", "dragonfly lub qhov muag", tsom iav hauv cov thav ntawv loj, nrog decorations.