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1.56 Umphezulu weFlethi yeBifocal / Umphezulu oRounding / Iilensi ezibonakalayo zeHMC eziDityanisiweyo
IiLensi zeBifocals ziilensi zokubukela eziqulathe zombini iindawo zokulungisa kwaye zisetyenziselwa ikakhulu ukulungisa i-presbyopia. Ummandla apho ii-bifocals zichanekileyo zokubona kude kuthiwa yi-far vision area, kwaye ummandla olungisa kufuphi nendawo yombono ubizwa ngokuba kufuphi nendawo yombono kunye nendawo yokufunda. Ngokuqhelekileyo, indawo ekude inkulu, ngoko ikwabizwa ngokuba sisilayi esiphambili, kwaye indawo ekufutshane incinci, ebizwa ngokuba yi-sub slice.
