Kukho iindidi ezi-4 eziphambili zombono-immetropia, iMyopia, i-hyperopia, kunye ne-astigmatism.
Emmetropia umbono ogqibeleleyo. Iliso sele likhanyise ngokugqibeleleyo i-retina kwaye alifuni ukulungiswa kweglasi.
I-myopia iqhele ukuba yaziwa ngokuba yingcinezelo ekufutshane. Ivela xa iliso elincinci kakhulu, likhokelela ekukhanyeni kokugxila phambi kwe-retina.
Ukuze ulungiselele iMyopia, ugqirha wakho wamehlo uya kumisela iilensi ze-thanus (-x.xx). Ezi zinto thabatha i-lens ityhala inqaku lokugxila ngasemva ukuze ilungelelanise ngokuchanekileyo kwi-retina.
I-Myopia yeyona ndlela ixhaphakileyo yempazamo yokuvuselelwa kuluntu lwanamhlanje. Ngapha koko, kubalulekile ukuba sibe sisizwe sehlabathi, njengokuba ngaphezulu kwenani labantu kufumanisa ukuba i-genentle idlulileyo minyaka le.
Aba bantu banokubona kakhulu kufutshane, kodwa izinto ezikude zibonakala zibuthathaka.
Kubantwana, unokuwuphawula umntwana onobunzima bokufunda iBhodi esikolweni, ukubamba izixhobo zokufunda (iifowuni, i-iPads esondele kakhulu kwiTV ngoba "okanye ukuchitha amehlo abo kakhulu.
I-hypetropia, kwelinye icala, yenzeka xa umntu ebona kude, kodwa kunokuba nzima ukubona izinto zisondele.
Ezinye zezikhalazo ezixhaphakileyo nge-hyperopes ayikwazi ukubona, kodwa endaweni yokuba bafumane intloko emva kokufunda okanye ukwenza umsebenzi wekhompyuter, okanye amehlo abo aziva ediniwe okanye ekhathalelwe.
I-hypetropia yenzeka xa iliso limfutshane kakhulu. Ke ngoko, ukukhanya kugxilwe kancinci emva kwe-retina.
Ngombono oqhelekileyo, umfanekiso ungabinamphezulu kumphezulu we-retina. Ngoxinzelelo (i-hyperopia), iCornea yakho ayiphili kakuhle, ke indawo ekugxilwe kuyo iwela ngasemva kwe-retina. Oku kwenza izinto ezisondeleyo zibonakale blurry.
Ukulungisa i-hyperopia, ogqirha bamehlo anika i-procet plus (+ + X.xx) iilensi zokuzisa inqaku lokugxila phambili kwi-retina.
U-Astigmatism sisihloko sonke. I-Astigmatism yenzeka xa umphezulu wangaphambili weliso (i-cornea) ayijikelezi ngokugqibeleleyo.
Cinga nge-cornea eqhelekileyo ejongeka njenge-basketball esisikiweyo kwisiqingatha. Kuyinto egqibeleleyo kwaye ilingane kuzo zonke iindlela.
I-Atigmatic Cornea ijongeka ngathi iqanda elibiweyo lisikiwe kwisiqingatha. I-Meridian enye inde kunenye.
Ukuba ne-meridies ezimbini ezahlukileyo zeliso kuphumela kwiindawo ezimbini ezahlukeneyo zokugxila. Ke ngoko, iilensi zeglasi kufuneka zenziwe ukuba zilungiswe kuwo omabini amakhosikazi. Lo mthetho uza kuba namanani amabini. Umzekelo-1.00 -0.50 x 180.
Inombolo yokuqala ichaza amandla afunekayo ukulungisa i-meridian enye ngelixa inani lesibini lichaza amandla afunekayo ukulungisa enye i-meridian. Inombolo yesithathu (x 180) ichaza nje apho ama-merides amabini axoka (anokususela kwi-0 ukuya kwi-180).
Amehlo anjengeprinta yeminwe-akukho zibini zezinto ezifanayo. Sifuna ukuba ubone okona kulungileyo, ngoko ke ngeentlobo ngeentlobo ze-lenses zelensi yeLensi sinokusebenza kunye ukufumana isisombululo esifanelekileyo sokuhlangabezana neemfuno zakho.
Indalo iphela inokubonelela ngeelensi ezingcono ukulungisa iingxaki ezingasentla ze-Ophthalmic. I-Pls igxile kwiimveliso zethu:www.universyeoptical.com/Pives