BIFOCAL a me ka holomua

Bifocal

He lens me ʻelua kahua o ka ʻike i hoʻokaʻawale ʻia e kahi laina.ʻO ka mea maʻamau, ua koho ʻia ka luna no ka mamao-ʻike a i ʻole ka mamao kamepiula a ʻo ka lalo no ka hana ʻike kokoke e like me ka heluhelu.

I loko o kahi lens Bifocal, ʻokoʻa ʻokoʻa nā ʻāpana ʻelua o ka ʻike e aʻike ʻialaina.He 28mm ka laula o ka wahi heluhelu ma lalo a aia ma lalo pono o ka laina waena o ka lens.E hoʻopili ʻia ke kūlana kino o ka wahi bi-focal e ke kiʻekiʻe kino o ka lens i koho ʻia.

He 30mm a ʻoi aku paha ke kiʻekiʻe o ka lens no ka lens Bifocal.Manaʻo mākou i kahi lens lōʻihi no ka ʻaʻahu ʻoluʻolu, akā ʻo 30 mm ke kiʻekiʻe haʻahaʻa no ka lens bifocal.Inā ʻoi aku ka liʻiliʻi o ke kiʻi i koho ʻia ma mua o 30mm, pono e koho ʻia kahi kiʻi ʻokoʻa no nā lens Bifocal.

Holomua

E pili ana kēia i ka hoʻolālā lens e loaʻa ana i nā māhele he nui o ka ʻike, me ka ʻole o nā laina, a i kekahi manawa ua kapa ʻia ʻo ia he "no-line multi-focal".I loko o kahi lens holomua, ʻo ke ʻano o ka ʻāpana i hoʻoponopono ʻia o ka lens e like me ke ʻano o ka funnel a i ʻole ka halo.

Ma kahi Kūlana Kūlana, ʻo ka ʻāpana luna no ka ʻike mamao, e hōʻemi ana i ka waena haʻahaʻa no ka ʻike waena, a ma ka ʻaoʻao lalo no ka ʻike heluhelu.ʻOi aku ka liʻiliʻi o nā wahi waena a me nā wahi heluhelu ma mua o ka wahi mamao.ʻO Standard Progressives ka mea i hoʻohana pinepine ʻia.

Ma kahi Workspace Progressive, ʻo ka ʻāpana luna no ka ʻike waena, a ʻo ka hapa lalo no ka ʻike kokoke a heluhelu paha;ʻaʻohe ʻike mamao ma kahi Workspace Progressive.Aia nā ʻano ʻelua o ka holomua o ka papa hana: ka holomua waena, a me ka holomua kokoke.He kūpono ka Mid-Range Progressive no ka hana kokoke e pili ana i nā hiʻohiʻona koʻikoʻi e like me nā lolouila papapihi a me nā hālāwai, ʻoiai ʻo ka Near-Range Progressive ʻoi aku ka maikaʻi no nā hana kokoke e like me ka heluhelu lōʻihi, ka hoʻohana ʻana i ka lima lima, a me ka hana hana.

ʻO ke kiʻekiʻe o ka lens no ka lens holomua he 30mm a ʻoi aku paha.Paipai mākou i kahi lens kiʻekiʻe no ka ʻaʻahu ʻoluʻolu, akā ʻo 30 mm ke kiʻekiʻe o ka lens.Inā liʻiliʻi ke kiʻekiʻe o kēia kiʻi ma mua o 30mm, pono e koho ʻia kahi kiʻi ʻokoʻa no nā lens holomua.