Umbuzo: Iyiphi impahia yegraneal?
Ngethuba lokuhlolwa kwam lens yonyaka, ugqirha wam uhlawula umrhumo owongezelelweyo wegraphicalgraphy. Yintoni igraphicalgraphy?
Impendulo: Ulwaphulo lwe-corneal yinkqubo esetyenziselwa ukubeka iliso nokulinganisa utshintsho olwenzeka kwimeko kunye nesigqibelelo se-eye yeliso lakho. Iiprojekthi zeprographicgrapherpher i-series of rings ekhanyisiweyo, ekubhekiswe kuyo njenge-placido disc, kwi-cornea, eboniswa emva kwesixhobo.
Emva kokuhlalutya iindandatho zokukhanya, ikhomputer yenza i-mapping cornea. Imifanekiso eveliswa ngumdlali wezobugcisa ingaba luncedo kumgqirha weziliso lakho xa uhlalutya impilo yakho kwamehlo.
Yintoni i-cornea?
Iimpawu ezibonakalayo ezibonakalayo, ezenziwe ngumbumba zembethe iris kunye nomfundi. I-cornea inikeza i-2/3 yamandla okuphikisa kwiso. I-cornea yinto ephawulekayo yesikhumba esenziwe ngamaseli akhethekileyo. Akukho mijelo yegazi kwi-cornea ukubonelela ukutya. I-cornea ifumana ininzi yesondlo sayo ngokukhawulezileyo kwiinyembezi phezu komhlaba kunye nokuhleka kwamanzi (i-fluid egcwalisa igumbi langaphambili lelihlo) ngaphakathi kwiso. Ngenxa yokuba i-cornea ifana ne-lensi, kufuneka ibe yinto ecacileyo kwaye imithwalo yegazi ingaphazamisa inkqubo yokugxila.
Yintoni eyenziwa ngegraphicalgraphy?
Iimoji zezolimo zineenkcukacha zinika ubuninzi beenkcukacha malunga neliso kwiindawo ezahlukeneyo:
- I-Keratometry - Ngaphambi kokuba kuqulunqwe i- computer ye- togragrapher ye-corneal, i-keratometer yayisetyenziselwa ukulinganisa indawo encinci kwi-cornea ephakathi. Inika ugqirha amabini emilinganiselo malunga nobukhulu be-cornea. I-keratometer ubugcisa obudala kodwa uya kufumana ubuncinane omnye kwi-ofisi yoogqirha nanamhlanje. Nangona kunjalo, i-colneal dipography iye yatshintsha uhlalutyo lwemizimba ye-corneal. Esikhundleni sokulinganisa amagosa amabini, i-corneal topographer ingakwazi ukulinganisa amakhulu kunye namawaka eenkcukacha zedatha yokwakha imephu ebalaseleyo yembala yobuninzi belihlo kunoma yiphi indawo ugqirha unomdla kuyo. indawo ekufundeni nasezindaweni ezinqabileyo eziluhlaza okwesibhakabhaka. Oku akubaluleki kuphela kubume bonke kodwa uza kuxela ugqirha ngokuchanekileyo ukuba u- astigmatism olunjani.
- Iimephu zokuphakama - Iimpawu zezolimo ze-Corneal zingabonisa iimephu zokuphakama. Iimephu zamandla zinceda ugqirha ukubona amabala angavamile kwi-cornea ehluke ngokungaqhelekanga kwinto eqhelekileyo. Elinye isofthiwe ibonisa umfanekiso o-3 ubukhulu ukuba ugqirha aguqulwe ukuze aqonde kangcono into enokuthi yenzeke nge-cornea.
- I-lens yoqhagamshelwano ifanelekile - Udokotela wakho wezilwanyana ufuna ukuba iilensi zakho zokudibana zilungele amehlo akho kunye nokusemandleni akho, kwaye ukwazi ukuma ngokusemthethweni kwe-cornea yakho kubaluleke kakhulu. I-lens zoqhagamshelwano ezinzima kakhulu zinokuthi zithinte ukukhawuleza kweendwangu , ukudala indawo engafanelekanga yesebenzi yeselula. Ngakolunye uhlangothi, ukufaka i-lens ekhululekile kungavumela ukunyuka kwelo lensi kwiso lakho, kubangela ukuphazamiseka kunye nomonakalo okwenziwe kwiiseli ze-epithelial. Ukujonga ii-lens zokudibanisa kudinga uxanduva olukhulu, ngawe kunye nogqirha wakho. . Kufuneka ukhuthalele ukulandela iindlela zokucoca ezifanelekileyo kunye nokubeka iishedyuli. Ugqirha wakho kufuneka alandele ngokukhawuleza utshintsho oluthile emehlweni akho ukuze ugweme iingxaki ezinxulumene nazo ezinzulu.
- Ukuhlolwa kwamehlo omile - Iinyembezi zakho zinzima kakhulu. Enye yemisebenzi yefilimu yokulila kukuvelisa ubuso obuqhekezayo apho ukukhanya kuya kuphazamisa iliso. Ngaphandle kwezinyembezi, zikhona izikhalazo ezincinci kwi-cornea. Oku kudala indawo embi kakhulu. Iinyembezi zizalisa zonke izikhewu ukwenza i-optical surface surface. Ukuba unamehlo omeleyo, umgangatho awuyi kukhanya kwaye umboniso wakho uya kuphazamiseka. Kufana nokutshitshisa iilensi zakho kwiiglasi zakho. I-corneal topographer iyakwazi ukubonisa indlela i-rough surface kunye nendlela iso elomileyo elinokuchaphazela ngayo umbono wakho.
Umthombo:
U-Elliott, uDavid B. Iinkqubo zeeNkcazo zokuNakekelwa kweziliso zasePrayimari, uPp 115-116. Elsevier Limited, 2003.