Astigmatism yog ib hom kab mob qhov muag ntau heev, feem ntau tshwm sim los ntawm pob txha curvature. Astigmatism feem ntau yog tsim los ntawm congenitally, thiab qee zaum, astigmatism tuaj yeem tshwm sim yog tias lub sijhawm ntev chalazion compresses lub pob muag ntev. Astigmatism, zoo li myopia, yog irreversible. Feem ntau, astigmatism siab tshaj 300 degrees yog hu ua siab astigmatism.
Muaj ntau yam teeb meem cuam tshuam nrog cov iav astigmatism siab, tshwj xeeb tshaj yog rau cov menyuam yaus thiab cov hluas. Hauv kev ua haujlwm tiag tiag, peb cov kws kho qhov muag feem ntau ntsib cov neeg uas muaj astigmatism siab. Nws yog ib qho tseem ceeb heev uas yuav tsum xaiv cov lo ntsiab muag tsim nyog thiab thav ntawv.
Cov duab sib txawv ntawm astigmatism thiab myopia
Cov duab ntawm lub cornea yog qhov tsis sib xws, tsis yog spherical tab sis ellipsoidal. Lub zog refractive nyob rau hauv txoj kev ntsug thiab txoj kab rov tav yog txawv. Yog li ntawd, tom qab lub teeb sab nraud yog refracted los ntawm lub cornea, nws tsis tuaj yeem tsim kom pom tseeb thaum nws nkag mus rau sab hauv ntawm lub qhov muag. Hloov chaw, nws tsim ib txoj kab focal, ua rau lub retina rau Qhov projection yog qhov muag plooj, ua rau tsis pom kev. Teeb meem nrog astigmatism, tshwj xeeb tshaj yog me me astigmatism, tej zaum yuav tsis muaj kev cuam tshuam loj rau lub zeem muag, tab sis qib siab ntawm astigmatism yuav muaj kev cuam tshuam rau lub zeem muag.
Myopia tshwm sim thaum lub teeb sib luag sab nraud nkag mus rau hauv lub qhov muag thiab raug cuam tshuam los ntawm lub qhov muag qhov muag tsis pom kev. Kev tsom xam ntawm daim duab tsis tuaj yeem poob rau ntawm retina, ua rau muaj teeb meem ntawm qhov muag tsis pom kev nyob deb. Muaj qhov sib txawv tseem ceeb hauv cov duab ntawm myopia thiab astigmatism, thiab lawv kuj txawv heev hauv cov txheej txheem pom tseeb. Ntau tus neeg muaj kev nkag siab tsis txaus txog qhov no, ua rau muaj kev ntxhov siab.
Muaj qee tus neeg mob uas muaj astigmatism yooj yim, thiab feem ntau ntawm lawv muaj nyob ze astigmatism lossis deb astigmatism. Nyob rau hauv tus txheej txheem ntawm optometry, nws yog ib qho tseem ceeb tshwj xeeb los muab cov tshuaj kho raws li qhov sib txawv ntawm astigmatism thiab myopia.
Lub ntsiab txhais thiab tshwm sim ntawm siab astigmatism
Qhov hnyav ntawm astigmatism yog muab faib raws li qib. Astigmatism qis dua 150 degrees yog me ntsis astigmatism, astigmatism ntawm 150 thiab 300 degrees yog nruab nrab astigmatism, thiab astigmatism siab tshaj 300 degrees yog siab astigmatism. Siab astigmatism tuaj yeem ua rau muaj kev phom sij ntau rau peb lub qhov muag:
1. Ua rau mob taub hau, mob qhov muag, thiab lwm yam: astigmatism siab tsis kho yuav ua rau mob taub hau, mob qhov muag, thiab lwm yam. Nws tuaj yeem yooj yim ua rau lub cev tsis zoo xws li lub taub hau qaij. Yog li ntawd, cov neeg uas muaj astigmatism hnyav yuav tsum tau kho.
2. Pom kev qaug zog: Vim yog lub zog sib txawv ntawm txhua qhov meridian, astigmatism tsis tuaj yeem ua kom pom tseeb thaum lub teeb pom kev sib luag, tab sis ob txoj kab focal, yog li lub hlwb muaj kev xaiv kev txhais cov khoom. Yuav kom pom cov scenery kom meej meej, astigmatism yuav tsum tau kho kom ntau li ntau tau kom txo tau qhov loj ntawm lub voj voog ntawm diffusion los txhim kho cov duab zoo. Siab astigmatism, yog tias tsis kho kom raug lossis tsis muaj tsom iav, tuaj yeem ua rau mob taub hau, qaug zog thiab lwm yam tsos mob, ua rau nws yooj yim dua rau kev pom kev qaug zog. .
3. Pom qhov muag tsis pom kev ntawm cov khoom nyob ze thiab deb: Cov neeg uas muaj astigmatism hnyav tau pom qhov muag tsis pom ntawm ob qho tib si nyob deb thiab ze. Cov neeg mob feem ntau muaj tus cwj pwm ntawm ib nrab kaw lawv daim tawv muag thiab squinting rau hauv qhov khoob kom pom cov khoom kom meej. meej dua.
4. Tsis pom kev tsis pom kev: Hauv qhov muag astigmatic, lub hom phiaj pom kev nyob deb ntawm txoj kab focal ntawm lub retina yuav dhau los ua xim xim, cov npoo yuav plooj, thiab nws yuav nyuaj rau kev txheeb xyuas. Lub zeem muag yuav txo qis, thiab hauv qhov xwm txheej hnyav, ob qhov pom kev yuav tshwm sim. Ntxiv nrog rau lub cev astigmatism, txhua yam ntawm astigmatism tuaj yeem ua rau tsis pom kev.
5. Kev ntxhov siab ntawm lub qhov muag: astigmatism feem ntau kho nrog cov tsom iav zoo tib yam lossis cov lo ntsiab muag. Yog tias kev raug mob thiab chalazions ntawm daim tawv muag tsis kho raws sijhawm, lawv yuav tsim txom lub pob muag ntev thiab ua rau astigmatism. Qee zaum, astigmatism tuaj yeem ua ke nrog pseudomyopia. Nco ntsoov tias qhov pseudomyopia yuav tsum tau muab tshem tawm, thiab astigmatism tuaj yeem kho nrog tsom iav.
6. Amblyopia: Tus kab mob no tshwm sim nyob rau hauv siab astigmatism, tshwj xeeb tshaj yog hyperopic astigmatism. Vim tias nws nyuaj rau pom deb thiab ze kom meej meej, thiab lub zeem muag tsis tuaj yeem siv tau, amblyopia nquag tshwm sim, thiab tom qab ntawd strabismus tshwm sim.
High astigmatic tsom iav
Cov lo ntsiab muag siab astigmatic yog qhov nyuaj ua rau vim lawv lub zog sib sib zog nqus. Yog li ntawd, siab astigmatism feem ntau yuav nruab nrog high-refractive index resin lo ntsiab muag thiab aspherical designs, thiaj li hais tias lawv yuav tsis tshwm tuab heev. Nws yuav tsum tau muab sau tseg tias lo ntsiab muag nrog siab astigmatism yog feem ntau customized series ntawm lo ntsiab muag. Qhov siab dua qhov astigmatism, qhov nyuaj dua nws yog los kho, thiab ntau qhov kev txwv yuav tsum tau tsim. Rau cov astigmatism siab heev, cov kab nrib pleb kuj yuav tsum tau muab los pab nrog kev tsim lub lens.
Thaum xaiv thav duab, koj kuj yuav tsum xav txog cov yam ntxwv tshwj xeeb ntawm ultra-siab astigmatism. Txij li cov ntug tuab ntawm astigmatism lo ntsiab muag txawv heev, koj yuav tsum tau ceev faj tshwj xeeb thaum xaiv cov thav ntawv. Xaiv cov ntshiab titanium los yog titanium alloy thav duab nrog me me transverse diameters thiab cov khoom muaj zog toughness. Koj tuaj yeem xaiv acetate fiber ntau los yog phaj thav duab nrog zoo shrinkage. tos.
Nws tsis pom zoo kom xaiv frameless los yog ib nrab-thav duab thav duab. Nws yog qhov zoo dua los xaiv cov thav duab puv. Thaum ua thiab tsim khoom, them nyiaj tshwj xeeb rau qhov teeb meem ntawm qhov sib txawv ntawm lub lens uas hloov cov astigmatism axis ntawm lub lens vim tsis zoo siv tshuab thiab cov khoom ruaj khov.
Yuav ua li cas xaiv astigmatic thav duab:
A. Muab qhov tseem ceeb rau cov khoom siv hnyav
Qhov hnyav ntawm cov khoom siv thav duab yog ib qho ntawm cov khoom uas cuam tshuam rau qhov hnyav ntawm cov iav. Rau cov neeg uas muaj myopia siab, thaum xaiv cov thav ntawv, koj tuaj yeem them nyiaj ntau dua rau cov ntaub ntawv xws li titanium ntshiab, tungsten carbon, cov ntawv nyias, thiab TR90. Cov ncej ua los ntawm cov ntaub ntawv no feem ntau sib dua thiab hnav yooj yim dua. Zoo siab, ruaj thiab tsis yooj yim deformed.
B.Full frame> Ib nrab ncej> Frameless ncej
High astigmatism feem ntau muaj cov lo ntsiab muag tuab dua, thiab cov rimless thiab semi-rimless thav ntawv yuav nthuav tawm cov lo ntsiab muag, uas tsis tsuas yog cuam tshuam rau cov tsos, tab sis kuj ua rau cov thav duab yooj yim deform, ua rau kev hloov pauv hauv nruab nrab ntawm cov tsom iav thiab astigmatism axis ntawm lub ntsej muag. lo ntsiab muag, cuam tshuam cov nyhuv kho. Cov neeg uas muaj astigmatism siab yog qhov zoo dua los xaiv cov thav ntawv puv.
C. Cov ncej loj tsis yog qhov kev xaiv zoo
Cov neeg uas hnav cov tsom iav loj ntev ntev tuaj yeem ua rau pom kev tsis pom kev thiab qhov pom kev tsis pom kev. Hnav lawv rau lub sijhawm ntev yuav ua rau kiv taub hau thiab kiv taub hau. Cov tsom iav loj loj feem ntau hnyav thiab tsis haum rau cov neeg uas muaj myopia siab. Hnav lawv rau lub sijhawm ntev yuav ua rau hnyav hnyav ntawm lub qhov ntswg, uas tuaj yeem yooj yim ua rau deformation ntawm tus choj ntawm lub qhov ntswg lub sijhawm.
Muaj ntau yam tsis tseem ceeb rau optometry thiab tsom iav, xws li diopter thiab interpupillary nrug. Thaum hnav cov tsom iav loj loj, koj yuav tsum tau saib xyuas tshwj xeeb seb qhov chaw nyob deb npaum li cas rau qhov nruab nrab ntawm ob lub lo ntsiab muag sib haum rau qhov chaw nyob deb ntawm koj lub qhov muag. Yog tias muaj qhov sib txawv, txawm tias daim ntawv tshuaj ntawm cov tsom iav yog qhov tseeb, koj yuav hnov qhov tsis xis nyob tom qab hnav cov tsom iav. Sim xaiv ib lub thav duab nrog ib daim iav me me dav, thiab sim ua kom lub siab thiab qis qis me me, kom qhov kev nplij siab yuav tsis raug txo vim yog peripheral deformation.
D. Xaiv ib lub thav duab nrog qhov ze ze ntawm qhov tsom iav.
Lub qhov muag-qhov muag nrug yog hais txog qhov kev ncua deb ntawm lub rear vertex ntawm lub lens thiab pem hauv ntej vertex ntawm lub cornea. Kev kho lub ntsej muag astigmatism yog cylindrical lo ntsiab muag. Yog tias qhov muag-qhov muag nyob deb nce, lub zog refractive zoo yuav txo qis (qhov siab dua, qhov txo qis dua), thiab qhov kho qhov muag yuav txo qis. poob. Qhov kev ncua deb ntawm cov tsom iav ntawm cov tsom iav uas muaj astigmatic heev yuav tsum tsawg li tsawg tau. Nyob rau hauv cov nqe lus ntawm thav duab style xaiv thiab thav duab hloov, koj yuav tsum sim xaiv lub qhov ntswg los yog lo ntsiab muag nrog ib tug kuj ze ze ntawm lub tsom iav.
E. Tsis txhob xaiv cov tuam tsev uas nyias nyias
Yog tias cov tuam tsev nyias nyias, lub zog ntawm sab xub ntiag thiab sab nraub qaum ntawm lub thav duab yuav tsis sib npaug, ua kom yooj yim rau lub thav duab yuav ua rau sab saum toj-hnyav thiab muab feem ntau ntawm qhov hnyav ntawm tus choj ntawm lub qhov ntswg, ua rau cov iav zawv zawg. down yooj yim thiab cuam tshuam rau kev hnav khaub ncaws. Yog tias koj muaj astigmatism (tshwj xeeb tshaj yog cov uas muaj nruab nrab mus rau siab astigmatism), thaum xaiv cov iav, koj yuav tsum xaiv cov thav ntawv uas haum rau qhov sib nrug deb.
Kev cuam tshuam ntawm astigmatism axis txoj hauj lwm ntawm tsom iav
Lub astigmatism axis ntau yog 1-180 degrees. Kuv yuav tsom mus rau kev xaiv cov thav ntawv rau 180 thiab 90 astigmatism axes.
Ua ntej peb yuav tsum paub tias astigmatism axis yog nyob ntawm 180 °, ces lub thickness yog ntawm 90 ° ( ntsug kev taw qhia). Yog li ntawd, qhov siab ntawm tus ncej peb xaiv yuav tsum tsis txhob siab. Yog tias peb xaiv ib lub thav duab nrog ib lub thav duab qis, lub thickness nyob rau hauv txoj kab ntsug yuav raug hnav tam sim ntawd, thiab qhov tshwm sim lo ntsiab muag yuav ib txwm sib dua thiab nyias. (Yog hais tias lub thav duab siab, nws yuav ib txwm yog puag ncig; yog tias tus ncej qis, nws yuav yog square.)
Ntawm qhov tsis sib xws, yog tias txoj haujlwm axis yog 90, lub thickness yuav yog 180 (kab rov tav kev taw qhia). Feem ntau peb qhov tuab tshaj plaws yog nyob rau sab nraud, thiab lub thickness ntawm astigmatism yog ntxiv rau sab nraud, yog li lub thickness yog exaggerated. Yog li ntawd, lub thav duab yuav tsum me me thiab nyias, uas yog, qhov ze ntawm lub lens dav + nruab nrab beam dav yog rau koj interpupillary nrug, qhov thinner nws yuav. Nws yog ib qho tsim nyog yuav tau xaiv lub lens siab dua kom cov thickness tsis tshua pom.
Nyob rau hauv lub fitting ntawm tsom iav, "kev nplij siab" thiab "ntshiab" feem ntau yog contradictory thiab nyuaj rau reconcile. Qhov kev tsis sib haum xeeb no tseem pom tseeb dua ntawm cov tsom iav nrog astigmatism. Clarity xav tau kev yoog raws, tab sis kev nplij siab tsis tas txhais tau tias pom tseeb. Piv txwv li, tsis hnav tsom iav yog qhov nyiam tshaj plaws, tab sis nws yog qhov tseeb tsis meej.
Cov iav uas muaj astigmatism siab yog cov rhiab heev thiab xav tau kev txiav txim siab ntau dua hauv kev kho qhov muag thiab tshuaj. Thaum ntsib cov astigmatism siab, koj yuav tsum tau them sai sai rau qhov sib piv ntawm cov ncej / lub lens nrog astigmatism degree thiab axis txoj hauj lwm kom tsis txhob muaj kev tsis txaus siab ntawm cov neeg siv khoom thiab tsis xis nyob vim cov khoom muaj teeb meem.
Post lub sij hawm: Nov-17-2023