Bifocal Lens
Momwe Mungadziwire Ngati Mukufuna Ma Bifocals
Presbyopia ndi chikhalidwe chokhudzana ndi ukalamba chomwe chimabweretsa kusawona bwino pafupi. Nthawi zambiri zimawonekera pang'onopang'ono; mudzavutika kuti muwone bukhu kapena nyuzipepala pafupi ndipo mwachibadwa mudzazisuntha kutali ndi nkhope yanu kuti ziwoneke bwino.
Pafupifupi zaka 40, lens ya crystalline mkati mwa diso imataya kusinthasintha kwake. Akali ang'ono, mandalawa amakhala ofewa komanso osinthika, osinthika mosavuta kuti aziyang'ana pa retina. Pambuyo pa zaka 40, disolo limakhala lolimba kwambiri, ndipo silingasinthe mawonekedwe mosavuta. Izi zimapangitsa kuti zikhale zovuta kuwerenga kapena kuchita ntchito zina zapafupi.
Magalasi a Bifocal
Magalasi a magalasi a Bifocal ali ndi mphamvu ziwiri zokuthandizani kuwona zinthu patali mukataya mwayi wosintha kuyang'ana kwa maso anu chifukwa cha ukalamba, womwe umadziwikanso kuti presbyopia. Chifukwa cha ntchito yeniyeniyi, ma lens a bifocal nthawi zambiri amaperekedwa kwa anthu opitirira zaka 40 kuti athandize kubwezera kuwonongeka kwa maso chifukwa cha ukalamba.
Mapangidwe Atatu a Bifocal Lens
Mosasamala chifukwa chomwe mungafunikire kulembedwa kuti muwongolere masomphenya, ma bifocal onse amagwira ntchito mofanana. Gawo laling'ono m'munsi mwa lens lili ndi mphamvu yokonza masomphenya anu apafupi. Ma lens ena nthawi zambiri amakhala owonera patali. Gawo la mandala lomwe limaperekedwa pakuwongolera masomphenya apafupi litha kukhala la mawonekedwe atatu:
Chithunzi 1
The Flat Top imadziwika kuti ndi imodzi mwamagalasi osavuta kwambiri omwe mungagwirizane nawo, chifukwa chake ndiyomwe imagwiritsidwa ntchito kwambiri (FT 28mm imatchedwa kukula kwake). Ma lens awa ndi amodzi mwa omwe amapezeka mosavuta pafupifupi pafupifupi sing'anga iliyonse komanso ma lens otonthoza. The Flat Top imagwiritsa ntchito kukula kwathunthu kwa gawolo kuti ipatse wogwiritsa kuwerenga kotsimikizika komanso kusintha kwamtunda.
Chithunzi 2
Monga momwe dzinalo likusonyezera kuti bifocal yozungulira ndi yozungulira pansi. Anapangidwa poyambirira kuti athandize ovala kufika pamalo owerengera mosavuta. Komabe, izi zimachepetsa m'lifupi mwa masomphenya apafupi omwe amapezeka pamwamba pa gawolo. Chifukwa cha izi, ma bifocal ozungulira samakonda kwambiri kuposa ma flat-top bifocals. Gawo lowerengera limapezeka kwambiri mu 28mm.
Mtundu 3: Wosakanikirana
M'lifupi gawo la Blended bifocal ndi 28mm. Mapangidwe a lens awa ndicmwachiwonekere lens yowoneka bwino kwambiri ya ma bifocals onse, osawonetsa chizindikiro chilichonse. Komabe, pali 1 mpaka 2mm yosakanikirana pakati pa gawo la mphamvu ndi mandala. Kusakanikirana kumeneku kumakhala ndi malingaliro opotoka omwe angatsimikizire kuti sangasinthe kwa odwala ena. Komabe, ndi mandala omwe amagwiritsidwa ntchito ndi odwala omwe sasintha ma lens opita patsogolo.
