Astigmatism yog ib hom kev ua yuam kev, zoo ib yam li myopia (nearsightedness) thiab hyperopia (farsightedness). Nws yog ib qho ua rau pom qhov muag tsis pom kev uas tuaj yeem kho nrog tsom iav.

Astigmatism yog hais txog lub cornea (qhov tseeb "pem hauv ntej qhov rais" ntawm lub qhov muag) tsis zoo tag nrho-los yog tsis sib npaug nkhaus nyob rau hauv txhua axis, tab sis nws yog ntau steeply nkhaus ntawm ib tug axis thiab flatter ntawm lwm tus. Piv txwv li, yog tias koj xav txog lub ntsej muag moos, lub ntsej muag yuav ua kom nruj dua raws li 12 teev (ntu) axis thiab flatter raws li 3 teev (kab rov tav) axis. Txoj haujlwm ntawm lub cornea yog khoov lub teeb kom pab ua kom pom tseeb kom pom tseeb. Lub cornea nrog astigmatism khoov lub teeb los ntawm qhov sib txawv ntawm qhov sib txawv, yog li nws yuav tsis ua kom pom tseeb thiab tsis pom kev pom tseeb. Cov tsom iav tshwj xeeb yuav tsum tau them nyiaj rau astigmatism thiab muab qhov muag pom tseeb.

Ntau lub pob txha muaj qee qhov astigmatism (un-roundness lossis irregular shape). Qhov no tshwm sim ntau heev thiab tsis yog kab mob - nws tsuas yog muaj pes tsawg tus ntawm peb cov pob txha zoo li. Zoo li kev pom ze lossis pom deb, astigmatism tuaj yeem raug kho rau qee qhov kev kho lo ntsiab muag.

Cataract phais thiab astigmatism

Kev phais mob cataract txheem tsis kho astigmatism, tab sis yog tias koj qhov astigmatism tsis tau hais txog thaum lub sijhawm phais mob cataract, nws yuav xav tau cov iav ntau dua rau koj qhov pom kev zoo tshaj tom qab phais.

Muaj ntau txoj hauv kev los kho astigmatism thaum phais mob cataract. Txawm li cas los xij, kho astigmatism yog suav tias yog kev phais "refractive" vim tias nws tsis kho tus kab mob, tab sis nws yog npaj los txo qhov yuav tsum tau hnav tsom iav kom pom kev zoo tom qab phais. Yog li ntawd, ntau qhov kev pov hwm tsis them rau ib feem ntawm cov txheej txheem uas kho astigmatism. Kev tuav pov hwm tseem yuav them rau kev phais mob cataract thiab tus nqi ntawm tus qauv intraocular lens implant thaum lub sij hawm phais cataract, tab sis feem ntau yuav tsis them rau kev kho astigmatism, yog li tus nqi rau feem ntawm cov txheej txheem yuav yog koj lub luag haujlwm. Nws yog qhov zoo los xaiv qhov kev phais mob cataract yam tsis muaj kev kho astigmatism. Kev kho astigmatism yog ib qho kev xaiv.

Cov kev xaiv rau kev kho astigmatism thaum phais cataract

Ib hom tshwj xeeb ntawm lo ntsiab muag yog qhov chaw zoo los them nyiaj rau lossis kho koj qhov astigmatism.

Incisions yog ua nyob rau hauv lub steeper axis ntawm lub cornea rau "thov nws mus", uas txo qhov sib txawv ntawm steepness ntawm axes, rounding tawm los yog txo cov astigmatism thiab yog li txo koj xav tau rau cov tsom iav. Qhov no ntxiv me ntsis sij hawm phais los yog muaj kev pheej hmoo thiab tsis zoo li yuav nyuaj rau kho.

Tsis muaj kev xaiv tau lees tias muaj qhov tshwm sim zoo meej. Rau ib qho kev phais refractive, nws yog qhov ua tau tias peb yuav tsis tau raws nraim qhov peb xav tau thiab koj tseem yuav pom qhov zoo tshaj plaws thaum koj hnav tsom iav. Txawm li cas los xij, koj txoj hauv kev tau txais qhov pom kev zoo tshaj plaws yam tsis muaj tsom iav nce ntxiv yog tias koj xaiv qhov kev kho mob phais astigmatism.

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