● Magalasi opita patsogolo amafalanso kwa anthu amene amafunikira kuona patali komanso kuwongolera pafupi ndi maso, monga anthu amene amagwira ntchito ndi makompyuta kapena amene amafunika kuŵerenga kwa nthaŵi yaitali.Ndi magalasi opita patsogolo, wovala amangofunika kusuntha maso ake mwachibadwa, osapendekera mutu kapena kusintha kaimidwe, kuti apeze kuyang'ana bwino kwambiri.Izi zimawapangitsa kukhala abwino kugwiritsidwa ntchito tsiku ndi tsiku, chifukwa wovala amatha kusintha mosavuta kuchoka pakuwona zinthu zakutali kupita ku zinthu zapafupi popanda kusintha magalasi kapena magalasi osiyanasiyana.
● Poyerekeza ndi ma lens wamba (9+4mm/12+4mm/14+2mm/12mm/17mm), ubwino wa kapangidwe kathu katsopano kameneka ndi:
1. Kapangidwe kathu kofewa kofewa kungapangitse kusintha kwa astigmatism bwino m'dera lakhungu kuti muchepetse kukhumudwa kwa kuvala;
2. Timayambitsa mapangidwe a aspheric m'malo ogwiritsidwa ntchito kwambiri kuti apereke malipiro ndi kupititsa patsogolo mphamvu zowonongeka, zomwe zimapangitsa kuti masomphenya agwiritsidwe ntchito amveke bwino.