Ukukhetha amalensi okuxhumana afanele kudinga ukugxila emaphuzwini amaningana abalulekile. I-cornea, ungqimba olungaphandle lweso, ithambile futhi iyanwebeka. Nakuba incane cishe ngesigamu semilimitha, isakhiwo sayo kanye nomsebenzi wayo kuyinkimbinkimbi kakhulu, okunikeza u-74% wamandla okubuka amehlo eliso. Njengoba amalensi okuxhumana ethintana ngqo nobuso be-cornea, ukuwagqoka kuvimbe ngokungenakugwenywa ukumuncwa komoya-mpilo we-cornea ngezinga elithile. Ngakho-ke, ukukhetha amalensi akufanele kuthathwe kalula.

Kulokhu, odokotela batusa ukunaka kakhulu izinkomba ezilandelayo lapho bekhethaamalensi okuxhumana:

Izinto:
Ukuze uthole induduzo, khetha izinto ze-hydrogel, ezifanele kakhulu abantu abaningi abagqoka nsuku zonke, ikakhulukazi labo ababeka phambili induduzo. Ukuze uthole ukugqokwa okude, khetha izinto ze-silicone hydrogel, ezinikeza umoya-mpilo omningi futhi zilungele abantu abachitha amahora amaningi phambi kwamakhompyutha.

Ijika Eliyisisekelo:
Uma ungakaze ugqoke ama-contact lens ngaphambili, ungavakashela ikliniki yezokwelapha amehlo noma isitolo se-optical ukuze uhlolwe. Ijika eliyisisekelo lamalensi kufanele likhethwe ngokusekelwe ku-radius egobile ebusweni obungaphambili be-cornea. Ngokuvamile, ijika eliyisisekelo elisukela ku-8.5mm kuya ku-8.8mm liyanconywa. Uma amalensi eshelela ngesikhathi sokuguguleka, ngokuvamile kungenxa yejika eliyisisekelo elikhulu kakhulu. Ngokuphambene nalokho, ijika eliyisisekelo elincane kakhulu lingabangela ukucasuka kwamehlo ngesikhathi sokuguguleka isikhathi eside, liphazamise ukushintshana kokudabuka, futhi liholele ezimpawini ezifana ne-hypoxia.

Ukuvunyelwa kwe-oksijini:
Lokhu kubhekisela emandleni ezinto zelensi okuvumela umoya-mpilo ukuthi udlule, ngokuvamile okuvezwa njengenani le-DK/t. Ngokusho kwe-International Association of Contact Lens Educators, amalensi alahlwayo nsuku zonke kufanele abe nokuvuleka komoya-mpilo okungaphezu kuka-24 DK/t, kuyilapho amalensi agugile kufanele adlule ku-87 DK/t. Uma ukhetha amalensi, khetha lawo anokuvuleka komoya-mpilo okuphezulu. Kodwa-ke, kubalulekile ukuhlukanisa phakathi kokuvuleka komoya-mpilo kanye nokudluliswa komoya-mpilo:Ukudluliswa kwe-oksijini = Ukuvunyelwa kwe-oksijini / Ubukhulu obuphakathiGwema ukudukiswa yinani lokungenela komoya-mpilo elibhalwe ephaketheni.

Okuqukethwe kwamanzi:
Ngokuvamile, okuqukethwe kwamanzi okuphakathi kuka-40% kuya ku-60% kubhekwa njengokufanelekile. Ngaphezu kwalokho, ubuchwepheshe obungcono bokugcina umswakama welensi bungathuthukisa induduzo ngesikhathi sokuguguleka. Kodwa-ke, qaphela ukuthi okuqukethwe kwamanzi amaningi akuhlali kungcono. Nakuba okuqukethwe kwamanzi amaningi kwenza amalensi athambe, empeleni kungaholela emehlweni omile ngesikhathi sokuguguleka isikhathi eside.

Ngamafuphi, ukukhetha ama-contact lens kudinga ukucatshangelwa okubanzi ngesimo sakho samehlo, imikhuba yokugqoka, nezidingo zakho. Ngaphambi kokuwagqoka, hlolwa amehlo bese ulandela iseluleko sikadokotela wakho ukuqinisekisa impilo yamehlo.