Ukukhetha iilensi zoqhagamshelwano ezichanekileyo kufuna ukugxila kumanqaku amaninzi abalulekileyo. I-cornea, eyona maleko engaphandle yeliso, ithambile kwaye iyanwebeka. Nangona imalunga nesiqingatha semilimitha ebhityileyo, ukwakheka kwayo kunye nokusebenza kwayo kuphucuke kakhulu, ibonelela nge-74% yamandla e-refraction yeliso. Kuba ii-contact lens zidibana ngqo nomphezulu we-cornea, ukuzinxiba kuthintela ngokungenakuthintelwa ukufumana ioksijini ye-cornea ukuya kwinqanaba elithile. Ngoko ke, ukukhetha iilensi akufuneki kuthathwe lula.

Kule nkalo, oogqirha batusa ukuba banikele ingqalelo kakhulu kwezi zalathisi zilandelayo xa ukhetha contact lens:

Izinto:
Ukuthuthuzela, khetha izinto ze-hydrogel, ezifanelekileyo kuninzi lwabathwali bemihla ngemihla, ngakumbi abo babeka phambili induduzo. Ukunxiba okwandisiweyo, khetha i-silicone hydrogel imathiriyeli, enikezela ngeoksijini ephezulu yokungena kwaye ilungele abantu abachitha iiyure ezinde phambi kweekhompyuter.

Ijika elisisiseko:
Ukuba awuzange unxibe iilensi zoqhagamshelwano ngaphambili, ungandwendwela iklinikhi ye-ophthalmology okanye ivenkile yamehlo ukuze uvavanywe. Isiseko sesiseko seelensi kufuneka sikhethwe ngokusekelwe kwi-radius ye-curvature ye-front surface ye-cornea. Ngokuqhelekileyo, i-curve yesiseko ye-8.5mm ukuya kwi-8.8mm iyacetyiswa. Ukuba iilensi ziyatyibilika ngexesha lokunxiba, kudla ngokuba ngenxa yegophe elisisiseko elikhulu kakhulu. Ngakolunye uhlangothi, i-curve yesiseko encinci kakhulu inokubangela ukucaphuka kwamehlo ngexesha lokunxiba ixesha elide, iphazamise ukutshintshiselana kweenyembezi, kwaye ikhokelele kwiimpawu ezifana ne-hypoxia.

I-Oxygen Permeability:
Oku kubhekiselele kwisakhono se-lens sokuvumela ioksijini ukuba idlule, ngokuqhelekileyo ibonakaliswa njengexabiso le-DK/t. Ngokutsho kwe-International Association of Contact Lens Educators, iilensi ezilahlayo imihla ngemihla kufuneka zibe ne-oxygen permeability enkulu kune-24 DK / t, ngelixa iilensi ezongeziweyo zokugqoka kufuneka zidlule i-87 DK / t. Xa ukhetha iilensi, khetha ezo zineoksijini ephezulu yokungena. Nangona kunjalo, kubalulekile ukwahlula phakathi kwe-oxygen permeability kunye ne-oxygen transmissibility:I-Oxygen Transmissibility = I-Oxygen Permeability / Ukutyeba okuphakathi. Kuphephe ukulahlekiswa lixabiso le-oksijini lokungena elibhalwe kwipakethe.

Isiqulatho samanzi:
Ngokuqhelekileyo, umxholo wamanzi phakathi koluhlu lwe-40% ukuya kwi-60% ithathwa njengefanelekileyo. Ukongeza, itekhnoloji engcono yokugcina umswakama welensi inokuphucula intuthuzelo ngexesha lokunxiba. Nangona kunjalo, qaphela ukuba umthamo wamanzi ophezulu awusoloko ungcono. Ngelixa isiqulatho samanzi esiphakamileyo sisenza iilensi zithambe, oko kunokukhokelela ekubeni amehlo omileyo ngexesha lokunxiba ixesha elide.

Isishwankathelo, ukukhetha iilensi zoqhagamshelwano kufuna uqwalaselo olubanzi lwemeko yamehlo akho, imikhwa yokunxiba, kunye neemfuno. Ngaphambi kokuba uzinxibe, jonga amehlo kwaye ulandele iingcebiso zikagqirha wakho ukuqinisekisa impilo yamehlo.