Magalasi oyenera nokha ayenera kuganiziridwa mozama kuphatikiza ndi digiri yathu, mtunda wa ophunzira, mawonekedwe a chimango, bajeti, momwe mungagwiritsire ntchito ndi zina.
Mndandanda wa refractive uli ngati kukula kwa nsapato.Mosasamala mtundu, izi ndizozigawo zodziwika bwino, zomwe zimatha kumveka bwino ngati makulidwe a lens.Kukwera kwa refractive index, lens imachepa.Momwemonso 500 degree myopia, mandala a 1.61 ndi 1.56 woonda.
Ngakhale kuchuluka kwa refractive index ndikocheperako.Nthawi zambiri, kuchuluka kwa refractive index ndi, m'munsimu nambala ya Abbe ndi.Sankhani digiri yoyenera nokha
Ma index osiyanasiyana a refractive ali ndi manambala a Abbe osiyanasiyana.Nawa manambala a Abbe ogwirizana ndi ma index a refractive:
1.50
Ababe nambala 58
Nambala yokwera kwambiri ya Abbe ili pafupi ndi zochitika zamaso.Lens yozungulira idzakhala yokhuthala kwambiri ngati digiriyo ili yokwera.Ndi yoyenera kwa myopia ya digirii yotsika mkati mwa madigiri 250.Mpendero wapansi ndi waukulu, ndipo siwoyenera magalasi azithunzi zazikulu.
1.56
Abbe nambala 35-41
Nambala ya Abbe ndi yapakatikati, 1.56 ndiye cholozera chotsika kwambiri chamitundu yambiri ya ma lens, omwe ndi otsika mtengo komanso oyenera myopia mkati mwa madigiri 300;Osavomerezeka ngati kutentha kupitilira madigiri 350.Lens idzakhala yokhuthala pamene digiriyo ili yokwera.
1.60
Abbe nambala 33-40
1.60 ndi 1.61 ndi zilembo zosiyana zokhala ndi index yofananira.Palibe kusiyana.Malinga ndi mitundu yosiyanasiyana komanso mndandanda, kuchuluka kwa Abbe kumasiyana 33-40.Mwachitsanzo, chitetezo cha radiation cha mwezi wowala 1.60 ndi 33 dB, ndipo mndandanda wa PMC wa mwezi wowala ndi 40 dB.
1.67
Ababe nambala 32
Nambala yotsika ya Abbe, kubalalitsidwa kwakukulu ndi zotsatira zofananira.M'kati mwa 550-800 digiri myopia, 1.61 ndi yochuluka kwambiri, bajeti ndi yochepa, ndipo siiposa 1.71, kotero 1.67 ndi chisankho chosagwirizana.
1.71
Ababe nambala 37
Nthawi zambiri, kuchuluka kwa refractive index ya mandala, kutsika kwa nambala ya Abbe komanso kubalalitsidwa kwakukulu.Komabe, ndi kupambana kwaukadaulo wazinthu zamagalasi, lamuloli likuphwanyidwa.Mwachitsanzo, 1.71 ndi yocheperapo kuposa 1.67, ndipo nambala ya Abbe ndi yapamwamba.
1.74
Ababe nambala 33
Mndandanda wa refractive kwambiri ndi nambala ya Abbe ya mandala a resin ndi otsika, ndipo mtengo wake ndi wokwera kwambiri.Komabe, kwa myopia yapamwamba, palibenso njira ina.Kupatula apo, makulidwe nthawi zonse amakhala ozindikira kwambiri.Pamwamba pa madigiri 800 akhoza kuganiziridwa, ndipo madigiri oposa 1000 akhoza kuganiziridwa popanda kulingalira china chirichonse.Ingofanana ndi 1.74.
Nthawi yotumiza: Mar-09-2023