Tare da haɓaka wayar da kan masu amfani da amfani, yawancin abokan ciniki ba kawai suna mai da hankali ga sabis na kantin sayar da kayan abinci ba, har ma suna mai da hankali kan sha'awar samfuran da suka saya (lens).Zaɓin gilashin ido da firam ɗin yana da sauƙi, saboda yanayin yana nan kuma abin da mutum yake so a bayyane yake, amma idan ana batun zaɓin ruwan tabarau, kwakwalwar mutum ta fara yin rauni.Dukansu ruwan tabarau biyu ne masu gaskiya, kuma farashin sun bambanta, index refractive, Abbe number, anti-blue light, anti-gajiya… akwai ji na kusa rushewa!
A yau, bari kawai muyi magana game da yadda ake karya kalmar sirrin waɗannan sigogi na ruwan tabarau!
I. Fihirisar Refractive
Fihirisar refractive ita ce ma'aunin da aka fi ambata akai-akai a cikin ruwan tabarau, wanda aka bayyana a matsayin rabon saurin yaduwar haske a cikin yanayi zuwa na cikin ruwan tabarau.Yana sauti mai wahala, amma a zahiri abu ne mai sauqi.Yaduwar haske a cikin yanayi yana da sauri sosai, kuma wannan sigar tana bayyana yadda suka bambanta da juna.Ta wannan siga, za mu kuma iya sanin kaurin ruwan tabarau.
Gabaɗaya, ana nuna cewa mafi girman ma'aunin refractive, mafi ƙarancin ruwan tabarau kuma ana yin mafi kyawun kyawun ruwan tabarau.
Ma'anar resin resin gabaɗaya ita ce: 1.499, 1.553, 1.601, 1.664, 1.701, 1.738, 1.76, da dai sauransu. Gabaɗaya, ana ba da shawarar cewa mutanen da ke kusa da -3.00D ko ƙasa da haka za su iya zaɓar ruwan tabarau tsakanin 1.490 da 1.490.mutanen da ke kusa da -3.00D zuwa -6.00D na iya zaɓar ruwan tabarau tsakanin 1.601 da 1.701;kuma mutanen da ke da hangen nesa sama da -6.00D na iya yin la'akari da ruwan tabarau tare da ma'anar refractive mafi girma.
II.Lambar Abbe
Sunan lambar Abbe bayan Dr. Ernst Abbe kuma galibi yana bayyana tarwatsa ruwan tabarau.
Rushewar Lens (Abbe Number): Saboda bambance-bambance a cikin fihirisar refractive don nau'ikan raƙuman haske daban-daban a cikin matsakaicin matsakaici iri ɗaya, kuma farin haske ya ƙunshi nau'ikan nau'ikan haske masu launi daban-daban, kayan m za su fuskanci wani lamari na musamman na tarwatsewa lokacin da suke refracting farin haske, kama da tsarin da ke samar da bakan gizo.Lambar Abbe index ce ta juzu'i wacce ke wakiltar ikon tarwatsa kayan m, tare da ƙaramin ƙima yana nuni da tarwatsewa mai ƙarfi.Dangantakar da ke kan ruwan tabarau shine: mafi girman lambar Abbe, ƙaramin tarwatsewa kuma mafi girman ingancin gani.Yawan Abbe gabaɗaya yana tsakanin 32 zuwa 59.
III.Refractive Power
Ikon refractive yawanci ya ƙunshi guda 1 zuwa 3 na bayanai, gami da ikon sikeli (watau myopia ko hyperopia) da ƙarfin silindi (astigmatism) da axis na astigmatism.Spherical ikon wakiltar digiri na myopia ko hyperopia da cylindrical ikon wakiltar mataki na astigmatism, yayin da axis na astigmatism za a iya daukarsa a matsayin matsayi na astigmatism kuma an raba gaba ɗaya tare da mulki (a kwance), a kan mulkin (a tsaye), da kuma oblique axis.Tare da daidaitaccen ƙarfin silindi, sabanin ƙa'idar da axis na iya zama ɗan wahala don daidaitawa.
Misali, takardar sayan magani na -6.00-1.00X180 tana wakiltar myopia na digiri 600, astigmatism na digiri 100, da axis na astigmatism a cikin shugabanci 180.
IV.Kariyar Hasken Shuɗi
Kariyar hasken shuɗi sanannen magana ne a cikin 'yan shekarun nan, saboda hasken shuɗi yana fitowa daga allon LED ko fitilu kuma cutarwarsa tana ƙara fitowa fili tare da yaɗuwar amfani da kayan lantarki.
Lokacin aikawa: Fabrairu-21-2023