Keʻokeʻo Semi Hoʻopau ʻia 1.499 Index Flat Top Bifocal Lenses me ka ʻole o ka uhi ʻana CR39 Material

a. Kiʻekiʻe qualified rate i ka mana pololei a me ka paʻa

b. Kiʻekiʻe qualified rate ma cosmetics quality

c. Nā hiʻohiʻona optical kiʻekiʻe

d. ʻO nā hopena ʻoniʻoni maikaʻi a me nā hopena hoʻopiʻi paʻakikī/AR

e. E hoʻomaopopo i ka mana hana kiʻekiʻe

f. Hāʻawi manawa

ʻAʻole wale ka maikaʻi pāpaʻi, ʻoi aku ka nānā ʻana o nā lens semi-finished i ka maikaʻi o loko, e like me nā ʻāpana kikoʻī a paʻa, ʻoi aku hoʻi no ka freeform kaulana.

1) ʻO ka bifocal fused kaulana loa i kēia mau lā, he ʻano D ma kahi kokoke i ka ʻāpana i hoʻololi ʻia i 90 degere i huli ka ʻaoʻao palahalaha o ka "D" i luna. No kēia kumu, kapa ʻia nā D-seg bifocals "flat-top" (FT) a i ʻole "straight-top" (ST) bifocals.

2) He lens bifocal māhele D kēia. Loaʻa iā ia ka pōmaikaʻi ʻo ke kikowaena optical o ka ʻāpana ʻike kokoke o ka lens, ʻo ia ka ʻāpana o ka wahi heluhelu e hāʻawi i ka ʻike maikaʻi loa, aia ma luna o ka ʻāpana heluhelu. ʻO ka ʻāpana ākea loa o ka wahi heluhelu aia ma lalo pono o ka laina māhele, a ʻo ia ka ʻāpana o ka lens e hoʻohana ai ka mea hoʻohana.

1) He ʻano leki maʻalahi loa kēia e hiki ai i ka mea hoʻohana ke nānā pono i nā mea ma kahi kokoke a mamao loa ma o ka lens hoʻokahi.

2) Ua hoʻolālā ʻia kēia ʻano lens e hiki ai ke nānā i nā mea ma kahi mamao, ma kahi kokoke a me ka mamao waena me nā loli like i ka mana no kēlā me kēia mamao.