I-lens isakhiwo esicacileyo kwiso elimisiweyo ngokukhawuleza emva kwe-iris ezisa imibala yokukhanya ukugxila kwi- retina . I-crystalline lens ligama elinikezwa kwilensi yemvelo yokuba abantu bazalwa nabo. Iimfudu ezincinci ezifakwe kwi-lens zingenza i-lens ishintshe isimo, evumela amehlo ukuba agxininise kwizinto ezikufutshane okanye ezikude.
Kwaziwa nangokuthi: I- lens crystalline
Imisebenzi yeLens
I-crystalline lens inikela malunga neyesithathu kwisigxina sokugxilwa kweso. I-lens iguquguquka kwaye i-curvature ingatshintsha ngempembelelo yomzimba we-ciliary. Xa litshintsha i-curvature, i-lens iyancipha kwaye amandla akhula ukwenzela ukuba iliso linokugxila kwimifanekiso kwimimandla eyahlukeneyo. Olu tshintsho ekugxinineni luthiwa indawo yokuhlala. Xa iliso lethu lijongene nento esondele kakhulu kuthi, inkontileka yethu yomzimba yesikhombisi kwaye oku kukhulula iiselulense zelenjini ezithatha i-lens endaweni kwaye i-lens iyancipha. Xa iso lijonge imifanekiso ede kude, umzimba we-ciliary uphinde uvuselele, imilayilo yelenki igxininise kwaye i-lens iyancipha ekubunjeni kwaye oku kubangela imifanekiso kude ukuba ingqalelo.
I-Lens kunye neCraft
Ukukhahlela, okanye ukugoba kokukhanya ngaphakathi kweso, kwenzeka xa ukukhanya kuhamba nge-lens. Ukukhanya kugoba ngaphandle okanye ngaphakathi, kuxhomekeke kwilensi.
I-lens igxininisa imifanekiso kwi-retina. Ukuba i-lens ibangela ukuba kugxininiswe ukuba kwenzeke emva kwe-retina, ukubonakala kwangaphambili kwenzeka. Ukuba i-lens ibangela ukuba kugxininiswe ukuba kwenzeke phambi kwe-retina, kubonakala kwangaphambili . Ukugqoka iiglasi okanye ukudibanisa iilensi ezichanekileyo ezi ngxaki.
I-Lens ne-Presbyopia
Ngokuhamba kwexesha, i-lens ilahlekelwa yintsebenziswano yayo.
Ukulahleka kukubangela ukuba iliso lilahle ezinye zekhono layo lokugxila kwizinto ezikufuphi. Le meko yaziwa ngokuba yi-presbyopia. Ngeli-40 ubudala, abaninzi abantu bafuna iiglasi zokufunda. I-Presbyopia idla ngokubizwa ngokuthi "i-short arm syndrome" kuba abantu banokubamba izinto zokufunda kude nomzimba ukuba bafunde ngokulula. Abantu abaye banqanda i-presbyopia bangafaka isikhalazo sokufuna ukukhanya okungakumbi ukuba bafunde. Amehlo e-Presbyopic aziva aphelelwe amandla aze abonakale egula ngakumbi. Ezinye izigulane ze-presbyopic zingaphinde zibe nombono oguqukayo, njengoko amehlo abo azama ukugqithisa ngokugqithiseleyo ngenxa yokulahleka kombono.
I-Cataract yeLens
I-cataract i-clouding ye-lens. I-cataracts ikhula rhoqo njengoko senza iminyaka ukwenza ilensi ifufume. Inqweno i-cataract ikhula kancane, kwaye ingenakuchaphazela umbono kwiminyaka emininzi. Xa uneminyaka engama-65, ngaphezu kweepesenti ezingama-90 zabantu bane-cataract.
Ukwelashwa kweCataract kubandakanya ukutshintsha i-lens efudumele. Ngokususa i-lens efudumele, umbono uphucula kunye nomgangatho wobomi. Utyando lweCataract lubandakanya ukukhipha i-cataract nokufaka i-lens entsha ecacileyo kwindawo yayo. Inkqubo ivame ukuqhutyelwa phantsi kwe-anesthesia yengingqi kwisithuba sokugula, kuthatha ngaphantsi kweyure kwiimeko ezininzi.