Kev Txhais Lus ntawm Defocus Signal
"Kev tsis tsom ntsoov" yog ib qho teeb liab tseem ceeb uas tuaj yeem hloov pauv tus qauv kev loj hlob ntawm lub qhov muag uas tseem tab tom loj hlob. Yog tias hnav tsom iav thaum lub sijhawm loj hlob ntawm lub qhov muag, lub qhov muag yuav loj hlob mus rau qhov chaw ntawm lub teeb liab tsis tsom ntsoov kom ua tiav emmetropia.
Piv txwv li, yog tias siv lub lens concave rau ntawm lub qhov muag uas tseem tab tom loj hlob kom ua rau qhov tsis pom kev zoo (uas yog, qhov pom kev nyob tom qab lub retina), kom qhov pom kev poob rau ntawm lub retina, lub qhov muag yuav loj hlob sai dua, uas yuav txhawb kev loj hlob ntawm myopia. Yog tias siv lub lens convex, lub qhov muag yuav tau txais qhov tsis pom kev zoo, qhov nrawm ntawm lub qhov muag yuav qeeb, thiab nws yuav loj hlob mus rau hyperopia.
Lub Luag Haujlwm ntawm Cov Cim Qhia Defocus
Nws pom tau tias cov teeb liab defocus ntawm lub peripheral retina ua lub luag haujlwm tseem ceeb hauv kev tswj hwm kev loj hlob thiab kev txhim kho ntawm lub qhov muag, tshwj xeeb tshaj yog thaum cov teeb liab pom kev hauv nruab nrab thiab peripheral tsis sib xws, cov teeb liab peripheral yuav tswj hwm. Hauv lwm lo lus, cov teeb liab peripheral defocus muaj feem cuam tshuam ntau dua rau kev tswj hwm emmetropization dua li lub xeev defocus hauv nruab nrab!
Cov kws tshawb fawb ntseeg tias thaum hnav cov tsom iav pom kev ib txwm muaj, qhov chaw tsom mus rau nruab nrab raug thaij duab rau ntawm retina, tab sis qhov chaw tsom mus rau sab nraud raug thaij duab tom qab retina. Lub retina sab nraud tau txais lub teeb liab hyperopic defocus, uas ua rau lub qhov muag loj hlob thiab myopia tob zuj zus.
Kev tsim cov tsom iav tsis pom kev
Cov tsom iav ntau lub ntsiab lus me me uas tsis pom kev zoo yog tsim thiab tsim raws li lub hauv paus ntsiab lus ntawm peripheral myopia defocus, yog li ntawd cov duab peripheral tuaj yeem poob rau pem hauv ntej ntawm retina. Lub sijhawm no, cov ntaub ntawv xa mus rau lub qhov muag yuav qeeb qeeb qhov kev loj hlob ntawm lub qhov muag axis. Cov kev tshawb fawb sib txawv tau qhia tias nws cov nyhuv tswj myopia muaj feem cuam tshuam zoo nrog lub sijhawm hnav, thiab nws raug pom zoo kom hnav nws ntau dua 12 teev hauv ib hnub.
Kev tshawb fawb txog qhov loj ntawm qhov muag tsis pom kev zoo myopia qhia tau hais tias qhov muag tsis pom kev zoo ntawm cov duab retinal ua rau lub qhov muag loj hlob sai dua, ua rau lub qhov muag ntev dua thiab kev loj hlob ntawm myopia. Ntawm qhov tod tes, qhov muag tsis pom kev zoo ntawm cov duab retinal ua rau lub qhov muag loj hlob qeeb. Qhov chaw tsom mus rau pem hauv ntej ntawm retina vim yog qhov muag tsis pom kev zoo tuaj yeem ua rau lub qhov muag loj hlob qeeb tab sis tsis tuaj yeem ua rau lub axial ntev dua.
Rau cov tub ntxhais hluas uas muaj qhov ntev ntawm lub qhov muag tsis tshaj 24 hli, kev tiv thaiv thiab tswj qhov muag tsis meej pem zoo tshaj plaws ua ke tuaj yeem ua kom lub qhov muag ntev li qub thaum lawv laus. Txawm li cas los xij, rau cov tib neeg uas muaj qhov ntev ntawm lub qhov muag tshaj 24 hli, qhov ntev ntawm lub qhov muag tsis tuaj yeem luv dua.
Cov teeb me me ntawm cov tsom iav tsom iav ua rau muaj teeb meem myopic defocus hauv lub qhov muag, uas yog qhov tseem ceeb rau kev txo qhov mob myopia. Txawm li cas los xij, qhov muaj cov tsom iav me me ntawm cov tsom iav tsis tas yuav lav qhov ua tau zoo; cov tsom iav me me yuav tsum ua haujlwm tau zoo ua ntej. Yog li ntawd, cov thev naus laus zis tsim khoom thiab ua cov tsom iav me me ntawm cov tsom iav kuj sim cov txuj ci thiab thev naus laus zis ntawm cov tuam txhab tsim khoom.
Kev Tsim Cov Lens Micro-Focus Ntau Qhov
Nrog rau qhov tshwm sim ntawm "kev xav tsis meej," cov chaw tsim khoom siv lens loj tau tsim ntau hom lens defocus. Hauv ob xyoos dhau los, ntau lub lens micro-lens defocus kuj tau tsim tawm ib qho tom qab ib qho. Txawm hais tias lawv yog cov lens defocus ntau lub lens, muaj qhov sib txawv tseem ceeb hauv kev tsim thiab tus lej ntawm cov ntsiab lus tsom.
1. Kev Nkag Siab Txog Micro-Lens
Thaum hnav tsom iav pom kev ib zaug xwb, lub teeb uas los ntawm qhov deb tuaj yeem poob rau ntawm fovea, qhov chaw nruab nrab ntawm lub retina. Txawm li cas los xij, lub teeb los ntawm qhov chaw sab nraud, tom qab dhau los ntawm lub lens ib zaug xwb, tsis mus txog tib lub dav hlau ntawm lub retina. Vim tias lub retina muaj qhov nkhaus, cov duab los ntawm qhov chaw sab nraud poob tom qab lub retina. Thaum lub sijhawm no, lub hlwb ntse heev. Thaum tau txais qhov kev txhawb nqa no, lub retina yuav txav mus rau daim duab ntawm yam khoom, ua rau lub qhov muag loj hlob rov qab, ua rau qib ntawm myopia nce ntxiv tas li.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov:
1. Lub retina muaj lub luag haujlwm ntawm kev loj hlob mus rau ntawm daim duab.
2. Yog tias daim duab ntawm lub cornea nruab nrab poob rau ntawm qhov chaw ntawm retina, thaum daim duab peripheral poob tom qab retina, nws yuav ua rau pom kev deb tsis meej.
Lub luag haujlwm ntawm cov iav me me yog siv lub hauv paus ntsiab lus ntawm kev sib sau ua ke lub teeb nrog lub iav zoo ntxiv rau sab nraud kom rub cov duab sab nraud mus rau pem hauv ntej ntawm lub retina. Qhov no ua kom pom tseeb hauv nruab nrab thaum tso cai rau cov duab sab nraud poob rau hauv pem hauv ntej ntawm lub retina, tsim kev rub rau ntawm lub retina rau lub hom phiaj tiv thaiv thiab tswj.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov:
1. Txawm yog lub lens peripheral defocus lossis lub lens multi-focus micro-lens, lawv ob leeg rub cov duab peripheral mus rau pem hauv ntej ntawm retina kom tsim cov peripheral myopic defocus thaum tswj kev pom tseeb hauv nruab nrab.
2. Qhov cuam tshuam yuav txawv nyob ntawm seb cov duab peripheral poob rau ntawm pem hauv ntej ntawm lub retina puas defocus ntau npaum li cas.
2. Tsim Cov Lens Micro-Concave
Thaum pom cov iav tsom iav uas muaj ntau lub tsom iav me me, peb pom tau ntau lub tsom iav me me uas tsis pom tseeb, uas yog ua los ntawm cov iav uas muaj lub duab concave. Xav txog cov txheej txheem tsim qauv tam sim no, cov iav concave muaj peev xwm muab faib ua: cov iav kheej kheej uas muaj zog ib zaug xwb, cov iav uas tsis muaj lub duab micro defocus qis, thiab cov iav uas tsis muaj lub duab micro defocus siab (nrog qhov sib txawv ntawm lub zog ntawm qhov chaw nruab nrab thiab qhov chaw ncig).
1. Cov nyhuv ntawm cov iav tsom iav uas tsis muaj qhov tsis pom kev zoo ua tau raws li qhov xav tau, ua rau muaj kev tswj hwm myopia zoo dua.
2. Cov duab "tsis pom tseeb" tsis meej: Cov iav uas tsis pom tseeb heev ua rau muaj cov teeb uas tsis pom tseeb thiab sib cais. Yog tias lub teeb nyob rau pem hauv ntej ntawm lub retina meej dhau, nws yuav raug xaiv ua lub teeb pom kev tseem ceeb rau kev saib ze, ua rau cov duab tom qab ntawd pom deb tsis meej.
Cov txiaj ntsig ntawm kev siv cov iav uas tsis muaj micro-defocus siab:
1. Ua rau lub hlwb tsis pom kev zoo, cov menyuam yaus yuav tsis tsom ntsoov siv cov tsom iav me me, tab sis lawv yuav xaiv tsom ntsoov rau qhov chaw pom tseeb ntawm thaj chaw nruab nrab thiab ntug.
2. Tsim kom muaj qhov tsis pom kev zoo nrog qhov dav thiab tuab, ua rau muaj zog rub thiab txhim kho kev tswj hwm myopia zoo dua.
3. Kev Phom Sij ntawm Kev Saib Nrog Cov Lens Micro-Concave
Qhov kev txhawj xeeb loj tshaj plaws nrog cov tsom iav tswj myopia nrog cov tsom iav me me yog tias cov menyuam yaus yuav tsom mus rau cov khoom siv cov tsom iav me me, uas tuaj yeem muaj cov teebmeem tsis zoo hauv qab no:
1. Xaiv qhov pom ze ua lub cim tseem ceeb ntawm kev pom
2. Pom tsis meej ntawm cov khoom
3. Kev hnav mus sij hawm ntev cuam tshuam rau kev hloov kho
4. Ua rau muaj kev hloov kho tsis zoo thiab kev sib phim sib koom ua ke
5. Kev tswj tsis tau myopia thaum saib cov khoom nyob ze
Xaus lus
Nrog rau ntau yam ntawm cov iav tsom iav uas muaj ntau lub zeem muag me me uas tsis pom kev zoo (multi-focus micro-defocus lenses), kev xaiv qhov yog yog ib qho nyuaj heev. Txawm hais tias lub lens tsim li cas los xij, lub hom phiaj yog los tsim kom muaj ib daim duab meej ntawm lub retina thaum tswj hwm lub teeb liab myopic defocus uas ruaj khov thiab ruaj khov nyob rau pem hauv ntej ntawm lub retina kom qeeb qhov kev loj hlob ntawm myopia thiab qhov muag axial elongation. Kev ua haujlwm, thev naus laus zis, thiab kev lees paub zoo ntawm cov iav tsom iav uas muaj ntau lub zeem muag me me uas tsis pom kev zoo yog qhov tseem ceeb heev. Cov iav tsis zoo tsis yog tsuas yog ua tsis tau qeeb qhov kev loj hlob ntawm myopia thiab axial elongation xwb tab sis kev hnav ntev ntev tuaj yeem cuam tshuam rau kev hloov kho, ua rau muaj kev sib phim tsis zoo.
Lub sijhawm tshaj tawm: Lub Rau Hli-21-2024