Bifocal
Lens yokhala ndi magawo awiri a masomphenya olekanitsidwa ndi mzere.Nthawi zambiri kumtunda kumapangidwira kuyang'ana patali kapena pakompyuta ndipo pansi kumapangidwira ntchito zowonera pafupi monga kuwerenga.
Mu lens ya Bifocal, magawo awiri a masomphenya amasiyanitsidwa ndi azowonekamzere.Malo owerengera pansi ndi 28mm m'lifupi ndipo ali pansi pa mzere wapakati wa lens.Maonekedwe amtundu wa bi-focal adzakhudzidwa ndi kutalika kwa mandala osankhidwa.
Kutalika konse kwa mandala a Bifocal lens kuyenera kukhala 30mm kapena kupitilira apo.Timalimbikitsa mandala amtali kuti azivala momasuka, koma 30 mm ndiye kutalika kochepa kwa mandala a bifocal.Ngati chimango chosankhidwa chili ndi kutalika kwa mandala ochepera 30mm, chimango chosiyana chiyenera kusankha magalasi a Bifocal.
Zopita patsogolo
Izi zikutanthauza kamangidwe ka mandala komwe kumaphatikizapo magawo angapo a masomphenya, opanda mizere, ndipo nthawi zina amatchedwa "no-line multifocal".Mu lens yopita patsogolo, mawonekedwe a gawo lokonzedwa la lens amakhala pafupifupi ngati fannel kapena bowa.
Mu Standard Progressive, gawo lapamwamba ndi la masomphenya a mtunda, kutsika mpaka kumunsi kwa masomphenya apakati, potsirizira pake mpaka pansi pa masomphenya owerenga.Madera apakati ndi owerengera akuyembekezeka kukhala ochepa kusiyana ndi mtunda.Standard Progressives ndi ma lens omwe amavalidwa kwambiri.
Mu Workspace Progressive, gawo lapamwamba ndi la masomphenya apakati, pamene gawo la pansi ndilo masomphenya apafupi kapena kuwerenga;palibe masomphenya akutali mu Workspace Progressive.Pali mitundu iwiri ya Workspace Progressives: Mid-Range Progressive, ndi Near-Range Progressive.Mid-Range Progressive ndi yoyenera ku ntchito yapafupi yomwe imaphatikizapo masomphenya olemera apakati monga makompyuta apakompyuta ndi misonkhano, pamene Near-Range Progressive ndi yabwino kwambiri yokhazikika pafupi ndi ntchito monga kuwerenga kwa nthawi yaitali, kugwiritsa ntchito zipangizo zogwiritsira ntchito pamanja, ndi kupanga.
Kutalika kwa lens kwa lens yopita patsogolo kuyenera kukhala 30mm kapena kupitilira apo.Timalimbikitsa mandala amtali kuti azivala bwino, koma kutalika kwa mandala ndi 30 mm.Ngati chimangochi chili ndi kutalika kwa mandala ochepera 30mm, chimango chosiyana chiyenera kusankhidwa cha magalasi opita patsogolo.
Nthawi yotumiza: Dec-10-2020