1.56 Pulasitiki Bifocal Photochromic UV420 Blue Cut Optical Lens

Pamene kusintha kwa diso la munthu kumafooka chifukwa cha ukalamba, ayenera kuwongolera masomphenya ake padera pa masomphenya akutali ndi pafupi.Panthawiyi, nthawi zambiri amafunika kuvala magalasi awiri padera, zomwe zimakhala zovuta kwambiri.Choncho, m'pofunika pogaya awiri osiyana mphamvu refractive pa mandala amodzi kukhala magalasi mbali ziwiri.Magalasi oterowo amatchedwa magalasi a bifocal kapena magalasi a bifocal.

Ma lens a Binocular kapena Bifocal lens ndi ma lens omwe amakhala ndi magawo awiri owongolera nthawi imodzi ndipo amagwiritsidwa ntchito makamaka pokonza presbyopia.

Ma lens a Binocular kapena Bifocal lens ndi ma lens omwe amakhala ndi magawo awiri owongolera nthawi imodzi ndipo amagwiritsidwa ntchito makamaka pokonza presbyopia.Malo omwe lens ya binocular imakonza masomphenya akutali amatchedwa masomphenya akutali, ndipo malo omwe masomphenya apafupi amawongoleredwa amatchedwa masomphenya apafupi ndi malo owerengera.Nthawi zambiri, gawo lakutali ndi lalikulu, motero limatchedwanso gawo lalikulu, pomwe gawo lapafupi ndi laling'ono, motero limatchedwa gawo laling'ono.

Kuwala kwa buluu kumagawidwa kukhala kopindulitsa komanso kovulaza.Kuwala kwa buluu komwe kumakhala pakati pa 415 ndi 455 nm ndi kuwala kwabuluu komwe kumafunikira kutetezedwa.Malinga ndi mfundo ya mtundu wowonjezera wa kuwala, buluu ndi chikasu ndi mitundu yogwirizana, kotero magalasi okhala ndi ntchito yoteteza kuwala kwa buluu adzakhala achikasu pang'ono poyerekeza ndi magalasi wamba.Kuchulukira kwa kutsekeka kwa kuwala koyipa kwa buluu, kumapangitsa kuti mtundu wakumbuyo wa magalasi odana ndi buluu ukhale wakuda.