Kuyini astigmatism, nezimbangela zayo futhi ukwelashwa

umsuka

Kakade kusukela igama ungakwazi kalula ukuqagela ukuthi yini astigmatism nalokho sihilela. Igama yasekuqaleni kwalesi sifo kuye etholakele egameni lesi Latin "inhlamba", okusho ukuthi "iphuzu". Kulokhu, ibhekisela isithombe ayiphoyinti. Leli gama wanikezwa hhayi ngengozi, ngoba okushiwo isifo amanga ngokungenaphutha lokuhlushwa okungalungile ugongolo imisebe yokukhanya.

Izici lesi sifo

Astigmatism kuyinto iso ingenye izifo ezivame kakhulu zomhlaba. Empeleni, elithile noma ngenye indlela, ababuzwayo cishe ingxenye yabo bonke abantu emhlabeni. Abaningi yalesi sifo iqala ekuqaleni kuka ebuntwaneni. Qonda lokho astigmatism kuyindlela elula, behlola ulwazi oluyisisekelo mayelana isakhiwo iso. Kuyaziwa ukuthi amehlo womuntu enezimiso ezimbili optical ngoba kwalungiswa izinkunga zokubona ukukhanya. Lona-cornea kanye lens, kubaluleke ngezinga elifanayo ukwakha isithombe ngakwesokudla kuyi-retina. Bobabili imiklamo yemvelo ahlukile, ngamunye has izici zayo siqu, kodwa ngento eyodwa banayo - umqondo lokho okubizwa ngomlobokazi ugobile. I-cornea umuntu enempilo has a isakhiwo nge ugobile cishe ephelele. Ngakho, ukukhanya ugongolo Ukudlula therethrough useyakwazi ncamashi kuyi-retina. Ngo abantu umbono kahle, lezi zibalo washintsha.

Kuyini astigmatism kusukela iphuzu zesayensi of umbono

Ngakho-ke yini astigmatism? Lokhu angaboni kahle kwenzeka njalo, kodwa kunzima kakhulu ukuchaza. Ezimweni ezingavamile, isizathu itholakala ayilungile ifomu lens amehlo. Kodwa iningi labo lesi sifo ngqo walandisa ukuhlanekezela optical ukuthi kuvamile kubo bonke lens. Futhi njengoba i-cornea , kakhulu, it has a ukuma eyindilinga, kuba umqondo esingokwemvelo kuso. Ifomu elifanele kubhekwa ukuba eyindilinga ngokuphelele, uyakwazi refract imisebe yokukhanya kunoma iyiphi indiza okufanayo. Kodwa kukhona futhi isicaba, noma, kunalokho, side. a-cornea okunjalo ayikwazi ukugxila isithombe, ugobile yayo ezindaweni ezithile zihlukile, futhi ngenxa yalokho imisebe falling kuyi-retina, etholwe engalingani. Lokhu kubangela ukuhlanekezela ukusetshenziswa langempela izinto ezisizungezile. Emehlweni umuntu uhlushwa astigmatism, akukho iphuzu elilodwa ebalulekile, ngokungafani kuya iso lomuntu enempilo. Ngenxa usongene focus isithombe okukhipha akucacile, futhi uma nge wabuka esilufifi.

Kuyini astigmatism atholwe uhlobo

Kuyaziwa ukuthi lesi sifo sibangela ukuba ningabi nje kuphela abadala: ngokuvamile kutholakala izingane. Kungaba astigmatism azalwa naso noma bathenga. Kugcine kwenzeka uma umuntu elimele ngokomzimba kubangelwa nezibazi e-cornea kanye emva embi zokukhokhelwa - ngenxa ukuhlinzwa okungafanele.

astigmatism azalwa naso: ukuthi kuyini nokuthi kuzibonakalisa.

Kulokhu, uma kuziwa isici azalwa naso umbono, kuziwa e ufuzo. Ngokuvamile, astigmatism uhlushwa lokuzalwa labo izingane ezinabazali banaso lesi sifo futhi akhona. Kodwa uhlobo azalwa naso lesi sifo uphansi angaboni kahle futhi cishe akusho konakalise nokucija bawo futhi ngenxa yalokho isikhathi akushaywa mkhuba. Abantu abaningi kukho konke ukuphila kwakhe ngisho nokuwabona ukhona.

Izimpawu ze-astigmatism

Symptomatology lesi sifo kubonakala nje kuphela ukuwohloka ezisobala ukuthi ngaphandle Ukungenela ngesikhathi esifanele uyakwazi ukuhambisa in a sigaba eyingozi. Astigmatism nakho ngokuvamile ihambisana bekhanda okwathatha isikhathi eside kangako umthwalo ezibukwayo, lacrimation ngokweqile, iso ukuvuvukala ezithathekayo imiphetho leminyaka. Kungenzeka okuvela conjunctivitis, amajaqamba emehlweni nokukhathala jikelele.

ekwelapheni lesi sifo

Okwamanje kabanzi izindlela ezintathu zokwelashwa astigmatism :

- izibuko;

- okokugqoka lens zokulungisa;

- ukuhlinzwa.

Emacaleni ezimbili zokuqala isebenzisa lens eziyinkimbinkimbi futhi izibuko kokuba isakhiwo cylindrical. Inkinga iwukuthi kwaze kwaphelela butholakale kulelizwe bona. Kufanele senze izibuko okunjalo futhi lens oda. Babevame kuye kudingeke ukuba bashintshe ngaphezu kwesikhathi esisodwa ukuthola ofanele, kabasi ezishibhile. Ngaphezu kwalokho, iziguli eziningi ukuthuthukisa ukungabekezelelani, eshubisa izimpawu astigmatism kuphela: iso ukungakhululeki, ikhanda noma isiyezi.

kokungenela Wasebenza kunezinzuzo abalulekile. Senziwa ukuthuthukiswa wamanje ubuchwepheshe pretty masinyane futhi aqede ogulayo isidingo okwengeziwe umbono ukulungiswa ngezinye izindlela. Ugobile cornea kuleli cala ngokwenyama iqedwe. indlela Steel ukwelapha astigmatism has nekusebenta eliphakeme phakathi kwawo wonke akhona, ukuhlinzeka imiphumela emihle kakhulu esikhathini esifushane.