Kev txhais ntawm Defocus Signal
"Defocus" yog ib qho tseem ceeb pom kev tawm tswv yim teeb liab uas tuaj yeem hloov cov qauv kev loj hlob ntawm cov pob muag. Yog hais tias defocus stimulation yog muab los ntawm hnav lo ntsiab muag thaum lub sij hawm qhov muag loj hlob, lub qhov muag yuav loj hlob mus rau txoj hauj lwm ntawm lub defocus teeb liab mus cuag emmetropia.
Piv txwv li, yog hais tias lub lens concave hnav ntawm lub qhov muag loj hlob los ua qhov tsis zoo ntawm qhov tsis zoo (uas yog, kev tsom mus rau tom qab retina), txhawm rau kom pom tseeb poob rau ntawm retina, lub pob muag yuav loj hlob sai, uas yuav txhawb nqa. kev loj hlob ntawm myopia. Yog hais tias lub lens convex hnav, lub qhov muag yuav tau txais qhov zoo defocus, qhov loj hlob ntawm lub qhov muag yuav qeeb, thiab nws yuav loj hlob mus rau hyperopia.
Lub luag haujlwm ntawm Defocus Signals
Nws tau pom tias cov teeb liab defocus ntawm lub peripheral retina ua lub luag haujlwm tseem ceeb hauv kev tswj hwm kev loj hlob thiab kev loj hlob ntawm lub qhov muag, tshwj xeeb tshaj yog thaum lub hauv paus thiab qhov muag pom kev tsis sib haum, cov teeb liab peripheral yuav dominate. Nyob rau hauv lwm yam lus, lub peripheral defocus signals muaj kev cuam tshuam ntau dua rau emmetropization kev cai tshaj lub hauv paus defocus xeev!
Cov kws tshawb fawb ntseeg tias thaum hnav ib lub ntsej muag pom kev zoo ib yam, lub hauv paus ua kom pom tseeb yog duab ntawm retina, tab sis lub ntsej muag tsom iav yog duab tom qab retina. Lub peripheral retina tau txais lub teeb liab hyperopic defocus, uas ua rau lub qhov muag axis loj hlob thiab myopia kom tob.
Tsim cov tsom iav defocus
Multi-point micro-transmission defocus tsom iav yog tsim thiab tsim raws li lub hauv paus ntsiab lus ntawm peripheral myopia defocus, kom cov duab peripheral tuaj yeem poob rau pem hauv ntej ntawm retina. Nyob rau lub sijhawm no, cov ntaub ntawv xa mus rau lub qhov muag yuav ua rau qeeb ntawm kev loj hlob ntawm lub qhov muag axis. Cov kev tshawb fawb sib txawv tau pom tias nws cov kev tswj xyuas myopia muaj kev cuam tshuam zoo nrog lub sijhawm hnav, thiab nws raug nquahu kom hnav nws ntev dua 12 teev hauv ib hnub.
Kev tshawb fawb ntawm qhov loj ntawm optical defocus myopia qhia tias qhov pom deb ntawm qhov pom ntawm cov duab retinal ua rau lub qhov muag loj hlob, ua rau elongation ntawm lub qhov muag thiab kev loj hlob ntawm myopia. Piv txwv li, nyob ze-sighted defocus ntawm retinal dluab slows down qhov muag loj hlob. Lub focal point ntog nyob rau hauv pem hauv ntej ntawm lub retina vim qhov ze-pob ntseg defocus tuaj yeem ua rau qhov muag pom kev loj hlob qeeb tab sis tsis tuaj yeem ua kom luv axial ntev.
Rau cov tub ntxhais hluas nrog lub qhov muag axis ntev tsis tshaj 24mm, qhov zoo tshaj plaws myopic defocus ua ke tiv thaiv thiab tswj kev ntsuas tuaj yeem ua kom lub qhov muag ntev ntev hauv cov neeg laus. Txawm li cas los xij, rau cov tib neeg uas muaj qhov muag axis ntev tshaj 24 hli, qhov ntev axial tsis tuaj yeem raug luv.
Micro-lens lub teeb beams ntawm cov tsom iav qhov muag tsim cov teeb meem myopic defocus hauv lub qhov muag, uas yog qhov tseem ceeb rau kev txo qis kev loj hlob ntawm myopia. Txawm li cas los xij, lub xub ntiag ntawm micro-lens ntawm lo ntsiab muag tsis tas yuav lav qhov ua tau zoo; micro-lens yuav tsum xub ua haujlwm zoo. Yog li ntawd, kev tsim thiab kev siv tshuab ntawm micro-lens ntawm lo ntsiab muag kuj kuaj cov khoom siv tes ua thiab thev naus laus zis ntawm cov tuam txhab tsim khoom.
Tsim ntawm Multi-Focus Micro-Lenses
Nrog rau qhov tshwm sim ntawm "defocus theory," cov tuam txhab loj loj tau tsim ntau hom defocus lo ntsiab muag. Nyob rau hauv ob xyoos dhau los, multi-focus micro-lens defocus lo ntsiab muag kuj tau launched ib tug tom qab lwm. Txawm hais tias lawv yog tag nrho cov tsom iav tsom iav, muaj qhov sib txawv tseem ceeb hauv kev tsim thiab tus naj npawb ntawm cov ntsiab lus tsom.
1. Kev nkag siab ntawm Micro-Lens
Thaum hnav ib lub tsom iav qhov muag, lub teeb los ncaj qha los ntawm qhov deb tuaj yeem poob rau ntawm fovea, qhov nruab nrab ntawm retina. Txawm li cas los xij, lub teeb los ntawm lub periphery, tom qab dhau los ntawm ib lub lens, tsis ncav cuag tib lub dav hlau ntawm retina. Txij li thaum lub retina muaj curvature, cov duab ntawm lub periphery poob qab lub retina. Lub sijhawm no, lub hlwb ntse heev. Thaum tau txais qhov stimulus no, lub retina yuav instinctively txav mus rau cov duab ntawm cov khoom, ua rau lub qhov muag loj hlob rov qab, ua rau cov degree ntawm myopia mus tas li.
Nws yog ib qho tseem ceeb kom nco ntsoov:
1. Lub retina muaj txoj haujlwm loj hlob ntawm cov duab.
2. Yog tias daim duab ntawm lub pob zeb hauv nruab nrab poob rau ntawm txoj hauj lwm ntawm lub retina, thaum cov duab peripheral poob qab ntawm lub retina, nws yuav ua rau pom kev deb.
Lub luag haujlwm ntawm micro-lens yog siv lub hauv paus ntsiab lus ntawm converging lub teeb nrog ib tug ntxiv zoo lens nyob rau hauv lub periphery kom rub cov duab peripheral mus rau pem hauv ntej ntawm lub retina. Qhov no ua kom pom tseeb hauv nruab nrab thaum tso cai rau cov duab peripheral poob rau hauv pem hauv ntej ntawm lub retina, tsim traction ntawm lub retina rau kev tiv thaiv thiab tswj lub hom phiaj.
Nws yog ib qho tseem ceeb kom nco ntsoov:
1. Txawm hais tias nws yog lub lens peripheral defocus los yog ntau lub ntsej muag micro-lens, lawv ob leeg rub cov duab peripheral mus rau pem hauv ntej ntawm retina los tsim peripheral myopic defocus thaum tuav lub zeem muag pom tseeb.
2. Cov nyhuv txawv nyob ntawm seb qhov defocus ntawm cov duab peripheral poob rau pem hauv ntej ntawm lub retina.
2. Tsim ntawm Micro-Concave Lenses
Nyob rau hauv cov tsos ntawm multi-focus micro-defocus lo ntsiab muag, peb tuaj yeem pom ntau lub ntsiab lus micro-defocus, uas yog tsim los ntawm ib tus neeg concave lo ntsiab muag. Xav txog cov txheej txheem tsim qauv tam sim no, cov lo ntsiab muag concave tuaj yeem muab faib ua: ib lub hwj chim kheej kheej lo ntsiab muag, tsis tshua muaj micro-defocus lo ntsiab muag, thiab siab tsis-micro-defocus lo ntsiab muag (nrog qhov sib txawv tseem ceeb ntawm lub zog nruab nrab ntawm qhov nruab nrab thiab qhov nruab nrab).
1. Cov duab thaij duab ntawm lub siab tsis yog micro-defocus lo ntsiab muag ua tau raws li qhov kev cia siab, muab kev tswj xyuas myopia zoo dua.
2. Blurring ntawm defocused "duab": High non-micro-defocus lo ntsiab muag tsim beams ntawm lub teeb uas tsis-focusing thiab diverging. Yog tias lub teeb liab nyob rau hauv pem hauv ntej ntawm lub retina yog qhov tseeb dhau lawm, nws tuaj yeem raug xaiv los ua lub teeb pom kev zoo rau kev pom nyob ze, ua rau cov duab tom ntej yuav pom deb-defocused.
Qhov zoo ntawm kev siv lub siab tsis-micro-defocus lo ntsiab muag:
1. Tsim cov duab teeb meem rau lub hlwb los ntawm kev tsis tsim kom pom tseeb, cov menyuam yaus yuav tsis tsom mus rau kev siv lub lens micro, tab sis yuav autonomously xaiv tsom rau qhov pom tseeb ntawm qhov chaw nruab nrab thiab qhov chaw nruab nrab.
2. Tsim myopic defocus nrog qhov dav thiab tuab, ua rau muaj zog traction thiab txhim kho myopia tswj kev ua tau zoo.
3. Kev phom sij ntawm saib nrog Micro-Concave Lenses
Qhov kev txhawj xeeb loj tshaj plaws nrog rau kev tswj cov lo ntsiab muag nrog lub lens micro-lens yog tias cov menyuam yaus yuav tsom mus rau cov khoom siv micro-lens, uas tuaj yeem muaj cov teebmeem hauv qab no:
1. Xaiv qhov ze saib raws li lub ntsiab teeb pom kev zoo
2. qhov muag tsis pom kev ntawm cov khoom
3. Kev hnav ntev ntev cuam tshuam rau kev hloov kho
4. Ua rau kev hloov pauv txawv txav thiab kev sib koom ua ke
5. Kev tswj tsis tau zoo ntawm myopia thaum saib cov khoom nyob ze
Hauv kev xaus
Nrog rau ntau yam ntawm ntau-focus micro-defocus lo ntsiab muag, xaiv qhov yog ib qho kev sib tw. Txawm hais tias lub lens tsim, lub hom phiaj yog tsim kom pom cov duab meej ntawm lub retina thaum tswj kom muaj kev ruaj ntseg thiab ruaj khov myopic defocus teeb liab nyob rau hauv pem hauv ntej ntawm retina kom qeeb qhov kev loj hlob ntawm myopia thiab qhov muag axial elongation. Cov khoom siv tes ua, thev naus laus zis, thiab kev lees paub zoo ntawm ntau lub ntsej muag micro-defocus lo ntsiab muag yog qhov tseem ceeb. Cov lo ntsiab muag tsis zoo tsis tsuas yog ua tsis tau kom qeeb myopia kev loj hlob thiab axial elongation tab sis ntev hnav tuaj yeem cuam tshuam rau kev hloov kho, ua rau muaj qhov txawv txav sib txawv.
Post lub sij hawm: Jun-21-2024