Lens ili ndi mawonekedwe omveka m'diso limene limamangidwe nthawi yomweyo kumbuyo kwa iris yomwe imabweretsa kuwala kofikira kuganizira za retina . Crystalline lens ndi dzina loperekedwa ku lenti yachirengedwe yomwe anthu amabadwa nayo. Minofu yaing'ono yomwe ili pamalopo ingathandize kuti disolo lisinthe mawonekedwe, omwe amalola maso kuyang'ana pa zinthu zakutali kapena zamtunda.
Amadziwika monga: Lens la Crystalline
Ntchito za Lens
Crystalline lens imapereka pafupi gawo limodzi mwa magawo atatu a mphamvu yowunika ya diso. Mandala amatha kusintha komanso kusintha kwake kumatha kusintha ndi mphamvu ya thupi. Mukasintha mphutsi, disolo limakula kwambiri ndipo mphamvu imakula kuti diso liganizire pazithunzi pamtunda wosiyana. Kusintha kumeneku kumatchedwa malo ogona. Pamene diso lathu likuyang'ana chinachake pafupi kwambiri ndi ife, thupi lathu lamagetsi limagwirizana ndipo izi zimatulutsa mitsempha ya mitsempha yomwe imagwiritsira ntchito disolo ndipo mandalawo amakula. Pamene diso liyang'ana pa mafano kutali, thupi lachilendo limatulutsa, mitsempha yowonongeka imayimitsa ndipo diso limachepetsanso makulidwe ndipo izi zimapangitsa mafano kutali kuti aganizire.
Lens ndi Kutsutsa
Kugwedeza, kapena kupindika kwa m'kati mwa diso, kumachitika pamene kuwala kukuyenda kupyolera mu lens. Kuwala kumawongolera kunja kapena mkati, malingana ndi disolo.
Pulogalamuyi imayang'ana zithunzi pa retina. Ngati mandala amachititsa chidwi kuti chichitike pambuyo pa retina, kuyang'ana kutali kumachitika. Ngati mandala amachititsa chidwi kuti chichitike patsogolo pa retina, kuyang'ana pafupi kukuchitika. Kuvala magalasi kapena malonda amatha kukonza mavuto awa.
Lens ndi Presbyopia
M'kupita kwa nthaŵi, lentiyo imataya pang'ono.
Kutayika uku kumapangitsa kuti diso lisathenso kuthekera kwina kuyang'ana pa zinthu zofupika. Matendawa amadziwika kuti presbyopia. Pafupi ndi zaka 40, anthu ambiri amafuna magalasi owerenga. Presbyopia kaŵirikaŵiri imatchedwa "matenda afupipafupi" chifukwa anthu amatha kuwerengera zakuthupi kutali ndi thupi kuti awerenge mosavuta. Anthu omwe ali ndi presbyopia angadandaule kuti akufunikira kuunika kwina kuti awerenge. Maso a Presbyopic amakhalanso otopa ndipo amawoneka kuti amatopa mosavuta. Odwala ena omwe amadziwika ndi mankhwalawa amakhalanso ndi masomphenya osintha, monga momwe maso awo akuyesera kugonjetsa zochepa za masomphenya.
Cataract ya Lens
Cataract ndi chimango cha disolo. Matendawa nthawi zambiri amakula pamene ife timakalamba kupanga mvula. Mwamwayi nsomba zimakula pang'onopang'ono, ndipo zingasokoneze masomphenya kwa zaka zingapo. Pofika zaka 65, anthu opitirira 90 peresenti ali ndi cataract.
Chithandizo cha cataract chimaphatikizapo kubwezeretsa mvula yamtambo. Pochotsa lenti, masomphenya amawoneka bwino ndi umoyo wa moyo. Kuchita opaleshoni ya Cataract kumaphatikizapo kuchotsa cataract ndikuika chomera chotsitsimutsa chatsopano pamalo ake. Ndondomekoyi imakhala ikuchitidwa pansi pa matenda a anesthesia pamtunda, kutenga nthawi yosakwana ora nthawi zambiri.