Incazelo yeSignali ye-Defocus
I-"Defocus" iyisignali ebalulekile yokubona engashintsha indlela yokukhula kwebhola leso elikhulayo. Uma ukukhuthazwa kwe-defocus kunikezwa ngokugqoka amalensi ngesikhathi sokuthuthukiswa kwamehlo, iso lizokhula liye endaweni yesignali ye-defocus ukuze kufezwe i-emmetropia.
Isibonelo, uma ilensi egobile igqokwa esweni elikhulayo ukuze kufakwe i-negative defocus (okungukuthi, i-focus ingemuva kwe-retina), ukuze i-focus iwele kwi-retina, i-eyeball izokhula ngokushesha, okuzokhuthaza ukuthuthukiswa kwe-myopia. Uma ilensi egobile igqokwa, iso lizothola i-defocus enhle, izinga lokukhula kwe-eyeball lizoncipha, futhi lizokhula liye ku-hyperopia.
Indima Yezimpawu Zokucisha Ukugxila
Kutholakale ukuthi izimpawu ze-defocus ze-peripheral retina zidlala indima ebalulekile ekulawuleni ukukhula nokuthuthukiswa kwebhola leso, ikakhulukazi lapho izimpawu ezibonakalayo eziphakathi nezingaphandle zingahambisani, izimpawu ze-peripheral zizobusa. Ngamanye amazwi, izimpawu ze-peripheral defocus zinomthelela omkhulu ekulawulweni kwe-emmetropization kunesimo se-central defocus!
Abacwaningi bakholelwa ukuthi uma ugqoka izibuko ezivamile zokubona okukodwa, ukugxila okuphakathi kuthathwa isithombe ku-retina, kodwa ukugxila okuseceleni kuthathwa isithombe ngemuva kwe-retina. I-retina engaphandle ithola isignali ye-hyperopic defocus, ebangela ukuba i-eye axis ikhule futhi i-myopia ijule.
Umklamo wezibuko ze-defocus
Izibuko ze-multi-point micro-transmission defocus zenzelwe futhi zakhiwe ngokwesimiso se-peripheral myopia defocus, ukuze isithombe se-peripheral sikwazi ukuwela phambi kwe-retina. Ngalesi sikhathi, ulwazi oludluliselwa ebholeni leso luzonciphisa ukukhula kwe-eye axis. Izifundo ezahlukene zibonise ukuthi umphumela walo wokulawula i-myopia uhlobene kahle nesikhathi sokugqokwa, futhi kunconywa ukuthi ugqoke isikhathi esingaphezu kwamahora ayi-12 ngosuku.
Ucwaningo ngesilinganiso esikhulu se-optical defocus myopia lubonisa ukuthi i-defocus ebonakalayo ekude yezithombe ze-retinal isheshisa ukukhula kwe-eyeball, okuholela ekwandeni kwe-eyeball kanye nokuthuthukiswa kwe-myopia. Ngokuphambene nalokho, i-defocus ebonakalayo eseduze yezithombe ze-retinal inciphisa ukukhula kwe-eyeball. Indawo egxile ewela phambi kwe-retina ngenxa ye-defocus ebonakalayo eseduze inganciphisa ukukhula kwe-eyeball kodwa ayikwazi ukufinyeza ubude be-axial.
Kwabancane abanobude be-eye axis obungadluli ku-24mm, izindlela zokuvimbela nokulawula ezihlanganisiwe ze-myopic defocus zingaqinisekisa ubude be-eye axis obujwayelekile lapho sebekhulile. Kodwa-ke, kubantu abanobude be-eye axis obudlula ku-24mm, ubude be-axial abukwazi ukufinyezwa.
Imisebe yokukhanya yama-micro-lens kumalensi engilazi yakha izimpawu ze-myopic defocus ngaphakathi kweso, okuyizihluthulelo zokunciphisa intuthuko ye-myopia. Kodwa-ke, ukuba khona kwama-micro-lens kumalensi akuqinisekisi ukusebenza kahle; ama-micro-lens kumele aqale asebenze kahle. Ngakho-ke, ubuchwepheshe bokukhiqiza nokucubungula ama-micro-lens kumalensi buhlola nobuciko kanye nobuchwepheshe bezinkampani zokukhiqiza.
Umklamo wama-Micro-Lenses amaningi agxile kakhulu
Ngokuvela kwe-"defocus theory," abakhiqizi abakhulu bamalensi bakhiqize izinhlobo ezahlukene zamalensi e-defocus. Eminyakeni emibili edlule, amalensi e-defocus e-micro-lens amaningi agxile kakhulu nawo aqaliswe ngokulandelana. Nakuba wonke angamalensi e-defocus amaningi agxile kakhulu, kunomehluko omkhulu ekwakhiweni kanye nenani lamaphuzu okugxila.
1. Ukuqonda Ama-Micro-Lenses
Uma ugqoke izibuko zamehlo ezibona ngamehlo ayedwa, ukukhanya okuvela ngqo kude kungawela ku-fovea, ingxenye ephakathi ye-retina. Kodwa-ke, ukukhanya okuvela emngceleni, ngemva kokudlula kulensi eyodwa, akufinyeleli endaweni efanayo ye-retina. Njengoba i-retina inokwehlela, izithombe ezivela emngceleni ziwela ngemuva kwe-retina. Kuleli qophelo, ubuchopho buhlakaniphe kakhulu. Lapho ithola lesi sikhuthazo, i-retina izohamba ngokwemvelo iye esithombeni sento, okwenza inhlamvu yeso ikhule emuva, okubangela izinga le-myopia liqhubeke nokukhula.
Kubalulekile ukuqaphela:
1. I-retina inomsebenzi wokukhula ibheke esithombeni.
2. Uma isithombe se-cornea ephakathi siwela endaweni ye-retina, kuyilapho isithombe esingaphandle siwela ngemuva kwe-retina, kuzobangela ukungaboni kahle.
Umsebenzi wama-micro-lens ukusebenzisa umgomo wokuhlanganisa ukukhanya ngelensi engeziwe enhle emngceleni ukuze kudonswe izithombe ezingaphandle ngaphambili kwe-retina. Lokhu kuqinisekisa umbono ocacile ophakathi ngenkathi kuvumela izithombe ezingaphandle ukuba ziwele engxenyeni engaphambili ye-retina, okudala ukubamba kwe-retina ngezinjongo zokuvimbela nokulawula.
Kubalulekile ukuqaphela:
1. Kungakhathaliseki ukuthi ilensi ye-peripheral defocus noma ilensi encane ene-multi-focus, zombili zidonsa izithombe ze-peripheral ngaphambili kwe-retina ukuze zenze i-peripheral myopic defocus ngenkathi zigcina umbono ocacile ophakathi nendawo.
2. Umphumela uyahlukahluka kuye ngokuthi izithombe ezingaphandle kwe-retina azigxili yini.
2. Umklamo wamaLensi Agobile Kancane
Ekubukekeni kwamalensi e-micro-defocus amaningi agxile kakhulu, singabona amaphuzu amaningi e-micro-defocus, akhiwa amalensi aqondene ngamanye. Uma sibheka izinqubo zokuklama zamanje, amalensi aqondene angahlukaniswa ngama-lens: amalensi ayindilinga anamandla alinganayo, amalensi angewona aqinile aphansi, kanye namalensi aphezulu angewona aqinile (ngomehluko omkhulu wamandla phakathi kwesikhungo kanye nomngcele).
1. Umphumela wezithombe wamalensi aphezulu angewona ama-micro-defocus uhlangabezana nokulindelwe, okunikeza ukulawula okungcono kwe-myopia.
2. Ukufiphala "kwezithombe ezingagxilile": Amalensi aphezulu angewona ama-micro-defocus adala imisebe yokukhanya engagxilile futhi ehlukanayo. Uma isignali ephambi kwe-retina icacile kakhulu, ingakhethwa njengesignali eyinhloko yokubuka eduze, okwenza izithombe ezilandelayo zibe ezingagxilile.
Izinzuzo zokusebenzisa amalensi angewona ama-micro-defocus aphezulu:
1. Ukudala ubunzima bokuthwebula izithombe ebuchosheni ngokungakhi ukugxila, izingane ngeke zigxile zisebenzisa ama-micro-lens, kodwa zizokhetha ngokuzimela ukugxila ezingxenyeni ezicacile eziphakathi kwendawo ephakathi nendawo kanye nomngcele.
2. Ukudala i-myopic defocus enobubanzi nobukhulu, okuholela ekubambeni okuqinile kanye nokusebenza kahle kokulawula i-myopia.
3. Izingozi Zokubuka Ngamalensi Amancane Agoqekile
Ukukhathazeka okukhulu ngamalensi okulawula i-myopia anama-micro-lens ukuthi izingane zingagxila ezintweni ezisebenzisa ama-micro-lens, okungaba nemiphumela emibi elandelayo:
1. Ukukhethwa kokubuka okuseduze njengesignali eyinhloko ebonakalayo
2. Ukubona izinto ngendlela efiphele
3. Ukugqoka isikhathi eside okuthinta ukulungiswa
4. Okuholela ekulungisweni okungavamile kanye nokuhambisana kokuhlangana
5. Ukulawula i-myopia okungasebenzi kahle lapho ubuka izinto eziseduze
Ekuphetheni
Njengoba kunezinhlobonhlobo eziningi zamalensi e-micro-defocus amaningi agxile kakhulu, ukukhetha elifanele kuba yinselele. Kungakhathaliseki ukuthi idizayini yelensi injani, umgomo uwukwakha isithombe esicacile ku-retina ngenkathi kugcinwa isignali ye-myopic defocus eqhubekayo nezinzile phambi kwe-retina ukuze kuncishiswe ukuqhubekela phambili kwe-myopia kanye nokwandiswa kwe-axial yeso. Ubuciko, ubuchwepheshe, kanye nokuqinisekiswa kwekhwalithi yamalensi e-micro-defocus amaningi agxile kakhulu kubalulekile. Amalensi asezingeni eliphansi awagcini nje ngokwehluleka ukunciphisela ukuqhubekela phambili kwe-myopia kanye nokwandiswa kwe-axial kodwa ukugqoka isikhathi eside kungathinta ukulungiswa, okuholela ekufaneni okungavamile kokuhlangana.
Isikhathi sokuthunyelwe: Juni-21-2024