I-Astigmatism

I-Astigmatism wuhlobo lwephutha lokubuyisa iso. Amaphutha wokukhononda abangela ukufiphala kwamehlo. Yizizathu ezivame kakhulu zokuthi kungani umuntu eya kochwepheshe bamehlo.

Ezinye izinhlobo zamaphutha wokubuyisa yilezi:

• Ukubona kude
• Ukubona eduze

Abantu bayakwazi ukubona ngoba ingxenye engaphambili yeso (i-cornea) iyakwazi ukugoba (ukukhombisa) ukukhanya bese ikubhekisa kwi-retina. Lokhu kungaphakathi kwangaphakathi kwamehlo.

Uma imisebe yokukhanya ingagxili ngokucacile ku-retina, izithombe ozibonayo kungenzeka zifiphele.

Nge-astigmatism, i-cornea igobile ngokungajwayelekile. Leli curve lidala ukuthi umbono ungacaci.

Imbangela ye-astigmatism ayaziwa. Kuvame ukuba khona kusukela ekuzalweni. I-Astigmatism ivame ukuhlangana nokubona eduze noma ukubona kude. Uma i-astigmatism iba yimbi kakhulu, kungaba uphawu lwe-keratoconus.

I-Astigmatism ivame kakhulu. Kwenzeka kwesinye isikhathi ngemuva kwezinhlobo ezithile zokuhlinzwa kwamehlo, njengokuhlinzwa kwamehlo.

I-Astigmatism yenza kube nzima ukubona imininingwane emihle, kungaba ukusondela noma ukude.

I-Astigmatism itholakala kalula ngokuhlolwa kwamehlo okujwayelekile nge-refraction test. Ukuhlolwa okukhethekile akudingeki ezimweni eziningi.

Izingane noma abantu abadala abangakwazi ukuphendula ekuvivinyweni okujwayelekile kokukhishwa bangakhishwa emuva ngokulinganisa okusebenzisa ukukhanya okukhanyayo (i-retinoscopy).

I-astigmatism emnene ingahle ingadingi ukulungiswa.

Izibuko noma amalensi oxhumana nawo azolungisa i-astigmatism, kodwa ungayelaphi.

Ukuhlinzwa kwe-Laser kungasiza ekushintsheni ukwakheka kobuso be-cornea ukuqeda i-astigmatism, kanye nokubona eduze noma ukubona kude.

I-Astigmatism ingashintsha ngokuhamba kwesikhathi, kudinga izingilazi ezintsha noma amalensi wokuxhumana. Ukulungiswa kombono we-Laser kuvame ukuqeda, noma kunciphise kakhulu i-astigmatism.

Ezinganeni, i-astigmatism engalungisiwe esweni elilodwa kuphela ingadala i-amblyopia.

Shayela umhlinzeki wakho wezokunakekelwa kwempilo noma i-ophthalmologist uma izinkinga zombono ziba zimbi, noma ungathuthuki ngezibuko noma ngamalensi oxhumana nawo.

• Ukuhlolwa kwe-acuity ebonakalayo

UChiu B, uJA Omncane. Ukulungiswa kwamaphutha wokubuyisa. Ku: Yanoff M, Duker JS, ama-eds. I-Ophthalmology. Umhlaka 5. IPhiladelphia, PA: Elsevier; 2019: isahluko 2.4.

UJain S, Hardten DR, Ang LPK, Azar DT. I-Excimer laser surface ablation: i-photorefractive keratectomy (PRK), i-laser subepithelial Keratomileusis (LASEK), ne-Epi-LASIK. Ku: Yanoff M, Duker JS, ama-eds. I-Ophthalmology. Umhlaka 5. IPhiladelphia, PA: Elsevier; 2019: isahluko 3.3.

U-Olitsky SE, uMarsh JD. Ukungajwayelekile kokuphanjiswa nendawo yokuhlala. Ku: Kliegman RM, St Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Incwadi kaNelson Yezingane. Umhlaka 21. IPhiladelphia, PA: Elsevier; 2020: isahluko 638.