Ngaba ngamanye amaxesha uziva ngathi ihlabathi alicacanga kangako? Xa uqhuba ebusuku, ngaba izibane zeemoto eziphambi kwakho zibonakala zingacacanga kangako? Okanye uziva ngathi awukwazi ukubona kakuhle nokuba usebenzisa iiglasi zakho? Esinye sezizathu eziphambili zoku kusenokuba ngumahluko omncinci kwimo yamehlo akho. Namhlanje, siza kuthetha ngovavanyo olulula, olungenabuhlungu olunokukunceda ufumane impendulo.
Yintoni iKeratometry?
Eli gama lisenokuvakala liyinkimbinkimbi kancinci, kodwa eneneni lilula kakhulu. Ngamafutshane, i-keratometry luvavanyo olulinganisa ukugoba, okanye imilo, ye-cornea emehlweni akho.
Ngoku usenokuba uzibuza ukuba yintoni i-cornea. Cinga ngeliso lethu njengekhamera elungileyo. Umaleko ocacileyo nomncinci ophambi kwale khamera yiloo nto siyibiza ngokuba yi-cornea. Ifana neglasi ekhuselayo phezu kwelensi yekhamera efowunini yakho. Ukukhanya kungena kweliso lethu ngale cornea. Ngoko ke, kubaluleke kakhulu ukuba imo yale cornea ibe yechanekileyo ukuze ube nombono ocacileyo. Uvavanyo lwe-keratometry lulinganisa loo milo.
Kutheni olu vavanyo lubalulekile? Luza kufumana ntoni?
Eyona meko iphambili neyona ixhaphakileyo efunyenweyo ngolu vavanyo yi -astigmatism . Le yimeko eqhelekileyo kakhulu ebangela ukubona okufipheleyo.
Masiyiqonde le nto ngokulula.
Ngokwesiqhelo, i-cornea yeliso eliphilileyo imile kakuhle, njengebhola yebhola, ukuze ukukhanya okungena elisweni kugxile kwindawo enye, okusivumela ukuba sibone umfanekiso ocacileyo.
Kodwa imilo ye-cornea yomntu one-astigmatism ayisosangqa sigqibeleleyo. Inokuba nde kancinci, njengebhola yombhoxo. Okanye inokuba igobile kwicala elinye, njengomva wecephe. Xa oku kusenzeka, ukukhanya okungena elisweni akujoliswanga kwindawo enye, kodwa kwiindawo ezininzi. Yiyo loo nto umbono ufiphele kwaye imifanekiso ibonakala ilula.
Ngoko ke, injongo ephambili yovavanyo lwe-keratometry kukufumanisa ukuba ngaba une-astigmatism, kwaye ukuba kunjalo, ukuya kuthi ga kwinqanaba elingakanani.
Olu vavanyo lubalulekile nakwezinye iimeko ezininzi:
- Ngaphambi kokuba unxibe iilensi zokunxibelelana: Ukuze ukhethe ilensi yokunxibelelana efanelana ngokugqibeleleyo neliso lakho, kufuneka wazi ubungakanani obuchanekileyo be-cornea yakho.
- Ngaphambi kotyando lwe-cataract: Ngexesha lotyando, kufakwa ilensi yokwenziwa (IOL) esweni. Ezi ndlela zokulinganisa i-keratometry zibalulekile ekukhetheni ilensi efanela kakuhle iliso lakho.
Lwenziwa njani olu vavanyo lweKeratometry?
Olu luvavanyo olukhawulezayo nolungabuhlungu. Lungenziwa ngexesha lovavanyo lwakho lwamehlo oluqhelekileyo. Akunyanzelekanga ukuba ubekele bucala usuku olwahlukileyo.
Kusetyenziswa isixhobo esibizwa ngokuba yi-'Keratometer' kule nto. Xa ujonga kuqala, sibonakala ngathi yiteleskopu encinci. Nangona kunjalo, asijongi iinkwenkwezi ezikude, kodwa sijonga amehlo akho kufutshane kakhulu. Makhe sijonge inyathelo ngenyathelo indlela olu vavanyo oluqhutywa ngayo.
| Amanyathelo | Kwenzekani? |
|---|---|
| 1. Zilungiselele | Uza kucelwa ukuba uhlale esitulweni, ubeke isilevu sakho kwindawo ekhethekileyo kumatshini, uze ubeke ibunzi lakho kwibhari ekhethekileyo. Oku kwenzelwa ukugcina intloko yakho ikwindawo enye ngexesha lovavanyo. Ugqirha uza kulungisa umatshini ukuze iliso lakho libe kwindawo efanelekileyo. |
| 2. Ukujonga ngesixhobo | Uza kucelwa ukuba ujonge ngembobo encinci kumatshini (i-eyepiece). Kufana nokujonga nge-binoculars. Usenokufuna nokuvala elinye iliso elingahlolwanga okwangoku. |
| 3. Ukujonga umfanekiso ongaphakathi | Ngaphakathi kumatshini, uza kubona umfanekiso ofana nezangqa ezintathu, okanye umfanekiso oneempawu ezilungileyo (+) nezingalunganga (-). Uyacetyiswa ukuba uwujonge ngaphandle kokuqhwanyaza. |
| 4. Ukulinganisa okurekhodiweyo | Njengoko ujonge loo mfanekiso, ugqirha ujika amaqhosha kumatshini ukuze enze loo mifanekiso. Ngesinye isihlandlo, ezo zimpawu zimbini ze-plus (+) ziyachukumisana. Ngaloo mzuzu kanye, urekhoda imilinganiselo. |
| 5. Ukujonga elinye iliso | Xa elinye iliso ligqityiwe, elinye iliso liyavavanywa ngendlela efanayo. Lonke uvavanyo luthatha ixesha elifutshane kakhulu, malunga nemizuzu embalwa. |
Ngaba kukho naziphi na iingozi okanye iingxaki kolu vavanyo?
Akunjalo konke konke. Olu luvavanyo olukhuselekileyo oluyi-100% . Alukubangeli mngcipheko okanye intlungu . Nangona ukukhanya okuvela kumatshini kukhanya kancinci, akuyi kuwonakalisa amehlo okanye umbono wakho.
Kodwa kukho into enye encinci. Endaweni yokubiza oku ngokuthi "yingxaki," cinga ngayo njengokwazi uhlobo lolu vavanyo. Uvavanyo lwe-keratometry alulovavanyo oluchanekileyo lwe-100% lwe-cornea yakho, kodwa luqikelelo oluhle kakhulu.
Ndiza kuchaza isizathu ngokulula. Cinga ngeglobe. Ijikelezwe kakuhle kwaye igudile. Kodwa siyazi ukuba uMhlaba wethu awugudile kangako, kukho iintaba ezinde njengeHimalayas, iilwandle ezinzulu njengeMariana Trench, nezinye izinto ezininzi ezifana neentlambo. Kwaye uMhlaba awungombhoxo ogqibeleleyo. Kodwa iglobe iluncedo olukhulu ekuqondeni apho ikhoyo iSri Lanka kwaye iphi iMelika, akunjalo?
Uvavanyo lwe-keratometry luyafana. Lulinganisa imilo ye-cornea yethu, sicinga ukuba yi-sphere egqibeleleyo. Enyanisweni, amehlo ethu akangoo-sphere abagqibeleleyo, kwaye kukho umahluko omncinci ngokwendalo kuwo. Kodwa sisixhobo esiluncedo kakhulu nesixabisekileyo sokufumanisa ngokukhawuleza nangokuchanekileyo ukuba une-astigmatism.
Kule mihla, abanye oogqirha bamehlo basebenzisa iimvavanyo eziphucukileyo, ezifana nokuchonga i-cornea, ezinokubonelela ngokulinganisa okuchanekileyo.
Zithini ezi zifundo ze-keratometry (ii-K readings)?
Iziphumo zolu vavanyo zibizwa ngokuba yi -'K readings' . Iyunithi yokulinganisa kwezi zinto ibizwa ngokuba yi -diopters .
Musa ukothuka ngala manani kunye neenkcukacha. Ezi zezokuba ugqirha wakho aziqonde. Uza kujonga ezi ziphumo aze afumanise unobangela ochanekileyo wokutshintsha kombono wakho.
| Imeko yamehlo | Uhlobo lokufunda kuka-K |
|---|---|
| I-cornea ephilileyo, engqukuva (i-Cornea eqhelekileyo) | I-cornea iyonke inexabiso elifanayo le-K elingaguqukiyo. Ngokwesiqhelo, eli xabiso limalunga ne-43 diopters. |
| Iliso eline-astigmatism | Uza kubona amaxabiso amabini e-K. Elinye lelona candelo liphezulu le-curve, nelinye lelona candelo lithe tyaba. Umahluko phakathi kwala maxabiso mabini ubonisa inqanaba lakho le-astigmatism. |
Olu fundo lwe-K luza kukhokela ugqirha wakho ekukhetheni iiglasi ezifanelekileyo, iilensi zoqhagamshelwano, okanye, ukuba kuyimfuneko, ilensi efanelekileyo yotyando.
Ndifanele ndimbone nini ugqirha wam?
Ugqirha wakho uza kukuxelela ukuba kufuneka uhlolwe amehlo akho kangaphi. Kubalulekile ukulandela loo shedyuli.
Imilo yamehlo ethu iyatshintsha ngokwendalo ngokuhamba kwexesha, ngoko ke izinga le-astigmatism linokutshintsha. Nangona kunjalo, ukuba ubona utshintsho olukhawulezileyo nolubalulekileyo ekuboneni kwakho, ingakumbi ukuba lufiphele kakhulu kunesiqhelo, musa ukulutyeshela. Lungaba luphawu lwemeko efana ne -keratoconus efuna unyango olukhawulezileyo. Ngoko ke ukuba ubona utshintsho olukhawulezileyo nolubalulekileyo ekuboneni kwakho, bonana nogqirha wakho ngoko nangoko.
Khumbula, olu ayilovavanyo onokuluphumelela okanye uluphumelele. Luvavanyo nje lokujonga ukuba amehlo akho asebenza kakuhle kangakanani na. Nokuba i-astigmatism yakho inzima kangakanani na, usenokubona ngokucacileyo ngeeglasi ezifanelekileyo, iilensi zoqhagamshelwano, okanye ezinye iindlela zonyango.
Umyalezo Wokuya Ekhaya
- I-Keratometry luvavanyo olulula, olungenazintlungu, nolukhuselekileyo lokulinganisa ukugoba kwe-cornea yakho.
- Oku ikakhulu kuchonga ukukhubazeka okuqhelekileyo kokubona okubizwa ngokuba yi-astigmatism.
- Iziphumo zovavanyo (ii-K readings) ziya kunceda ugqirha wakho ukuba akukhethele iiglasi ezifanelekileyo, iilensi zoqhagamshelwano, okanye iilensi zasemva kotyando.
- Ukuba ubona utshintsho olukhawulezileyo okanye olubalulekileyo, musa ukulutyeshela kwaye udibane nogqirha wamehlo ngoko nangoko.
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