Ilensi eqhubela phambili yilensi egxile kwizinto ezininzi. Ngokungafaniyo neeglasi zokufunda zesintu kunye neeglasi zokufunda ezijonge kabini, iilensi eziqhubela phambili azinalo ukudinwa kokuhlala zilungelelanisa ugxininiso lweliso xa usebenzisa iilensi ezigxininisiweyo ezimbini, kwaye azinawo umgca wokwahlulahlula ocacileyo phakathi kobude obugxininisiweyo obubini. Nxiba kamnandi, inkangeleko entle, ngokuthe ngcembe ube lolona khetho lubalaseleyo lwesihlwele se-presbyopia.