Ezimweni eziningi zokukhubazeka okubukwayo, i-myopia (i-closesightedness) noma i-hypermetropia (ukubhekwa phambili) ibonakala. Ukuqokwa kwezibuko ngaphansi kwezimo ezinjalo ezinhlobonhlobo kuhloswe ukuzinqanda ngokusiza ukusabalalisa noma ukuqoqa izibuko.
Indlela yokunquma isichazamazwi lapho ukhetha izibuko?
Ekukhetheni kwezibuko isiguli sisendaweni eyi-6m ukusuka etafuleni ekhethekile ejwayelekile. Iso ngalinye lihlolwe ngokwehlukana. Kusukela phezulu, isiguli sifunda izinhlamvu zomugqa ngamunye. Umugqa wokugcina ufundwa ubonisa ubunzima obubukwayo. Emva kwalokho, ubuthakathaka (ukugxila okude), bese kuthi kunamandla (ukugxila okufushane) izibuko ze-convex zisetshenziselwa iso. Isiguli sifunda uhlu lokugcina futhi, lokho ayengakubona. Iglasi eliqine kakhulu le-convex libonisa izinga lokubhekwa phambili.
Uma lo mbono wehla engilazini ye-convex, khona-ke izinga le-myopia elingahle lihlolwe. Lokhu kwenziwa ngosizo lwe-glass concave. Uma ingilazi ye-concave ingasizwa, imbangela yokuwohloka kwezinto ezibonakalayo icaciswa ngokungeziwe.
Izinhlobo zezibuko ezinezindiza
Izibuko ezihlukahlukene nge-diopters - izibuko-i-chameleons (photochromic). Basebenzisa i-lens photochromic, eguqula umbala, njll. i-darken, ngesenzo se-ultraviolet imisebe. Qaphela ukuthi ekamelweni elinezingqimba ama-chameleon awamnyama, ngoba ingilazi ye-silicate ayivumeli ukudlula kwe-ultraviolet.
Izibuko ze-chameleon ezifanelekayo zikhanyisa emaminithini amathathu, ziba mnyama ngomzuzu owodwa. Kulesi simo, amalensi kumele ashintshe umbala ngesikhathi esifanayo.
Izinkukhu zokuzivikela nazo zingaba ne-diopters. Zisetshenziswa ezemidlalo ezidlulele, ngebhayisikili, ezemidlalo ezemidlalo, ezisezintabeni ezintabeni, esibhakabhakeni, njll. Isici sabo ukuthi zenziwe ngezinto eziqinile kakhulu, ngakho lezi zibuko zivikela amehlo ekutholeni izinhlayiya eziqinile.
Izikhumba zokuzivikela zokubhukuda nge-diopter zivikela emisebeni ye-UV, futhi ukugqoka okhethekile ngaphakathi kwe-lens kuvimbela ukungena. Lapho ukhetha lolu hlobo lwezibuko, kufanele kukhunjulwe ukuthi amanzi akhuthaza umphumela wama-lens.
Izibuko zokushayela nge-diopters, ngaphezu kokulungisa amehlo, kufanele ziqinisekise ukuqedwa kwe-glare (ukusika), okwenza umehluko ongcono. Izibuko ezinjalo zingenziwa futhi ngezakhiwo ze-photochromic.
Kubantu abanamehlo ampofu, manje ungakhetha noma wenze ngokwezifiso izibuko zemibukiso nge-diopters. Ukukhipha imiphumela engakhululekile, udinga ukukhetha amamodeli wezibuko ezinamabala aphansi (ukuze ama-lens asendleleni efanayo phambi kwamehlo).
Abaningi lapho besebenza emakilasini ekhompiyutha abasebenzisa ikhompyutha, okuyinto, ngenxa yezihlungi ezikhethekile, ukunciphisa ubunzima emehlweni. Uma unenkinga ebonakalayo, kungenzeka ukuhlanganisa izibuko ezinjalo nama-contact lens. Enye indlela ukusebenzisa izibuko zekhompyutha nge-diopters efanele.
Uma ungakwazi ukubona kahle, ngakho-ke ukuchithwa kwamehlo kuhlukile, izibuko ezinezindiza ezihlukene zikhethiwe.
Kubantu abaningi abanamehlo ampofu, kudingeka izibilini ezimbili zezibuko - ngokuba "ibanga" nelithi "eduze" (uma ufunda). Kodwa kukhona ithuba lokusebenzisa izibuko ezilodwa ngezingcingo, kokubili ukufunda nokunye. Amalensi kulezi zibuko abizwa ngokuthi i-multifocal.
Amaphuzu nge-zero diopters (izibuko ezivamile) asetshenziswa njengezinto zokudlala, ukuze agcizelele isithombe.
Uma ufuna ama-glass glass nge-dioptries, sicela uqaphele ukuthi esikhathini esizayo esimweni sizoba yizibuko "iso lesikhumba", "iso le-dragonfly", izibuko ezifakiwe ezinkulu, nemihlobiso.