Iiglasi zesayensi ezidumileyo
Namhlanje, abantu abaninzi bathanda ukunxiba iiglasi, akukho nzima ukufumanisa ukuba iinkwenkwezi ezininzi ziya kunxiba ngokukhethekileyo iiglasi ukuze zibeke, kwaye abanye abantu baya kunxiba iiglasi ukuze babe nencwadi, ngamafutshane, ukunxiba iindondo kuye kwaba yifashoni, kodwa abanye bakhetha iiglasi ezikhethekileyo ezisebenzayo ukulungisa umbono okanye ukukhusela amehlo ngenxa ye-myopia, i-presbyopia. Ke, zeziphi iintlobo zeeglasi ezikhoyo?
Iindondo zelanga, eyaziwa ngokuba yizibuko zelanga, izibuko zelanga, zenzelwe ukukhusela amehlo eeglasi, i-lens idla ngokuba mnyama okanye imnyama, ukuphepha ilanga ukuvuselela amehlo. Inokusetyenziswa njengobuhle be-hipster yefashoni okanye ibonise isitayile sobuqu sezixhobo ezikhethekileyo.
Iiglasi zeMyopia. Ubukhulu becala kukusetyenziswa kwelensi yeconcave eneqondo logxininiso olufanelekileyo, ukuze ukukhanya kuhluke ngokufanelekileyo kwilensi econcave, emva koko ijikwe liliso ukwenza umfanekiso ocacileyo kwiretina. Iiglasi ze-Myopic zinefuthe elithile lokukhusela kwiingxaki ezibangelwa yi-myopia ephezulu.
I-Presbyopia yi-convex lens eyenzelwe ukulungisa i-presbyopia ehlayo kwilensi yeso.Iiglasi zokufunda, njengeeglasi ze-myopia, zinezibonakaliso ezininzi ze-optical ezichazwe yimigangatho yelizwe, kwaye kukho imithetho ekhethekileyo yokusetyenziswa.