Nā lens holomua no ka ʻike ma luna o 40
Ma hope o 40 makahiki, ʻaʻohe mea makemake e hoʻolaha i ko lākou mau makahiki - ʻoi aku ka nui o ka wā e hoʻomaka ai ʻoe e pilikia i ka heluhelu ʻana i ka paʻi maikaʻi.

ʻO ka mea pōmaikaʻi, ʻaʻole hiki i nā mea ʻē aʻe ke haʻi aku ua hiki ʻoe i ka "makahiki bifocal."

ʻO nā lens holomua - i kapa ʻia i kekahi manawa "no-line bifocals" - hāʻawi iā ʻoe i kahi hiʻohiʻona ʻōpio ma o ka hoʻopau ʻana i nā laina ʻike ʻia i loaʻa i nā lens bifocal (a trifocal).

ʻO nā pono o nā lens holomua ma mua o nā bifocals
ʻElua wale nō mana o nā maka aniani bifocal: hoʻokahi no ka ʻike ʻana i ka lumi a ʻo kekahi no ka ʻike kokoke.ʻO nā mea ma waena, e like me ka pale lolouila a i ʻole nā ​​​​mea ma ka papa hale kūʻai, hoʻomau pinepine ʻia me nā bifocals.

No ka ho'āʻo ʻana e ʻike pono i nā mea ma kēia ʻāpana "waena", pono nā mea hoʻohana bifocal e hoʻoluli i ko lākou poʻo i luna a i lalo, e nānā ʻē aʻe ma luna a ma lalo o kā lākou bifocals, e ʻike ai i kahi ʻāpana o ka lens e ʻoi aku ka maikaʻi.

Hoʻohālikelike nā lens holomua i ka ʻike kūlohelohe āu i hauʻoli ai ma mua o ka hoʻomaka ʻana o ka presbyopia.Ma kahi o ka hāʻawi ʻana i ʻelua mana lens e like me bifocals (a ʻekolu paha, e like me trifocals), ʻo nā lens holomua he mau lens "multifocal" ʻoiaʻiʻo e hāʻawi i ka holomua maʻemaʻe ʻole o nā mana lens he nui no ka ʻike maopopo ma waena o ka lumi, ma kahi kokoke a ma nā mamao āpau ma waena.

Me nā lens holomua, ʻaʻohe pono e kulou i kou poʻo i luna a i lalo a i ʻole e hoʻohana i nā kūlana ʻoluʻolu e ʻike i kāu pale kamepiula a i ʻole nā ​​​​mea ʻē aʻe ma ka lōʻihi o ka lima.

ʻIke kūlohelohe me ka "lele kiʻi" ʻole
ʻO nā laina ʻike ʻia i nā bifocals a me nā trifocals he mau kiko kahi e loli koke ai ka mana lens.

Ke neʻe ka laina ʻike maka o ka mea hoʻohana bifocal a trifocal paha ma kēia mau laina, neʻe koke nā kiʻi, a i ʻole "lele".ʻO ka ʻehaʻeha i hoʻokumu ʻia e kēia "lele kiʻi" hiki ke ʻano mai ka hoʻonāukiuki haʻahaʻa a hiki i ka hoʻokumu ʻana i ka nausea.

Loaʻa i nā lens holomua ka holomua ʻole o nā mana lens no ka ʻike maopopo ma nā mamao āpau.Hāʻawi nā lens holomua i kahi hohonu maoli o ka nānā ʻana me ka "lele kiʻi."

Ua lilo nā lens progressive i nā lens multifocal kaulana loa no ka poʻe me ka presbyopia e hoʻohana ana i nā maka aniani, no ko lākou mau hiʻohiʻona maikaʻi a maikaʻi hoʻi ma mua o nā bifocals a me nā trifocals.