Ngokuthuthukiswa kokuqwashisa ngokusetshenziswa kwabathengi, amakhasimende amaningi ngokwengeziwe awagcini nje ngokunaka isevisi yesitolo esisetshenziswayo, kodwa futhi anaka kakhulu ilukuluku lemikhiqizo ethengiwe (amalensi).Ukukhetha izibuko zamehlo namafreyimu kulula, ngoba inkambiso ikhona futhi izintandokazi zomuntu zicacile, kodwa uma kuziwa ekukhetheni amalensi, ubuchopho bomuntu buqala ukulimaza.Wonke angamalensi amabili abonisa ngale, futhi amanani ahluke nje, inkomba ye-refractive, inombolo ye-Abbe, ukukhanya okuluhlaza okwesibhakabhaka, ukulwa nokukhathala… kunomuzwa wokuwa okuseduze!
Namuhla, ake simane sikhulume ngendlela yokuphula iphasiwedi yale mingcele yamalensi!
I. I-Refractive Index
Inkomba ye-Refractive ipharamitha eshiwo kakhulu kumalensi, echazwa njengesilinganiso sejubane lokusakazeka kokukhanya emkhathini kuya kuleso ekulensini.Kuzwakala kunzima, kodwa empeleni kulula kakhulu.Ukusabalalisa ukukhanya emkhathini kuyashesha kakhulu, futhi le parameter ichaza ukuthi zihluke kangakanani komunye nomunye.Ngalesi pharamitha, singakwazi futhi ukwazi ubukhulu be-lens.
Ngokuvamile, kubonakala ukuthi uma inkomba ye-refractive iphakeme, i-lens iba mncane futhi i-lens ebukeka kahle kakhulu yenziwa.
Inkomba ye-refractive ye-resin ngokuvamile ithi: 1.499, 1.553, 1.601, 1.664, 1.701, 1.738, 1.76, njll. Ngokuvamile, kunconywa ukuthi abantu abanokubona eduze kuka -3.00D noma ngaphansi bangakhetha amalensi phakathi kuka-1.609 no-1.499;abantu abanokubona eduze kuka -3.00D kuya ku -6.00D bangakhetha amalensi phakathi kuka-1.601 no-1.701;futhi abantu abanokubona eduze ngenhla -6.00D bangacabangela amalensi anenkomba ephezulu ye-refractive.
II.Inombolo ka-Abbe
Inombolo ye-Abbe iqanjwe ngoDkt. Ernst Abbe futhi ichaza ngokuyinhloko ukuhlakazwa kwelensi.
I-Lens Disspersion (Inombolo ye-Abbe): Ngenxa yomehluko kunkomba ye-refractive yamaza amaza okukhanya ahlukene endaweni ekhanyelayo efanayo, nokukhanya okumhlophe okwakhiwa ngamaza ahlukene okukhanya okunemibala, izinto ezibonisa ngale zizothola isenzakalo esikhethekile sokuhlakazeka lapho kukhanyela ukukhanya okumhlophe, okufana nenqubo ekhiqiza uthingo.Inombolo ye-Abbe iyinkomba ye-proportionality ephambene emele ikhono lokusabalalisa lezinto ezibonisa ngale, ngevelu elincane elibonisa ukuhlakazeka okunamandla.Ubudlelwano obukwilensi buwukuthi: ukuphakama kwenombolo ye-Abbe, kuncane ukuhlakazeka kanye nekhwalithi yokubonwayo ephezulu.Inombolo ye-Abbe ngokuvamile iphakathi kuka-32 kuya ku-59.
III.Amandla Refractive
Amandla e-refractive ngokuvamile ahlanganisa u-1 kuya ku-3 ucezu lolwazi, okuhlanganisa amandla ayindilinga (okungukuthi i-myopia noma i-hyperopia) namandla ayi-cylindrical (astigmatism) kanye ne-axis ye-astigmatism.Amandla ayindilinga amele izinga le-myopia noma i-hyperopia futhi amandla e-cylindrical amelela izinga le-astigmatism, kuyilapho i-axis ye-astigmatism ingathathwa njengendawo ye-astigmatism futhi ngokuvamile ihlukaniswa nomthetho (okuvundlile), ngokumelene nomthetho (ngokuqondile), futhi i-oblique eksisi.Ngamandla alinganayo we-cylindrical, ngokumelene nomthetho kanye ne-oblique axis kungase kube nzima kancane ukuzivumelanisa.
Isibonelo, incwadi kadokotela ethi -6.00-1.00X180 imele i-myopia yamadigri angu-600, i-astigmatism engu-100 degrees, kanye ne-axis ye-astigmatism ekuqondeni 180.
IV.Blue Light Protection
Ukuvikela ukukhanya okuluhlaza yitemu elidumile eminyakeni yamuva nje, njengoba ukukhanya okuluhlaza okwesibhakabhaka kukhishwa ezikrinini ze-LED noma izibani futhi ukulimala kwakho kuya ngokuya kucaca ngokusetshenziswa kabanzi kwemikhiqizo ye-elekthronikhi.
Isikhathi sokuthumela: Feb-21-2023