Bangaki Abantu Abadukiswa Yinganekwane Yelensi "Encane Nelula"?

Uma uya esitolo sezinto ezibonakalayo, abasebenzi bavame ukuncoma amalensi anezikhombisi eziphezulu, becaphuna izizathu ezinjengokuthi "Uma i-index iphezulu, i-lens iba ncane futhi ilula, futhi kuzoba lula ukuyigqoka."

Ngokuhamba kwesikhathi, umqondo wokuthi "I-High Index = Ukukhanya Nokuncane" usuyinto ehlala injalo kubantu abaningi. Abanye baze bachithe imali encane kakhulu ku-index ephezulu ngangokunokwenzeka befuna ukukhuluphala nokukhanya okuphelele. Kodwa ingabe kunjalo ngempela?

Eqinisweni, umqondo wokuthi inkomba ephezulu ihlala isho ukuthi incane futhi ilula kakhulu uwukwenza kube lula kakhulu. Isisindo kanye nobukhulu bamalensi akunqunywa kuphela yinkomba yokukhanya.

Ukuze sicacise lo mbono ongalungile, sidinga kuqala ukuqonda ukuthi yini ngempela inkomba yokukhanya ethinta ilensi.

Kalula nje, inkomba yokukhanya ilinganisa ikhono lelensi lokugoba ukukhanya. Ngamandla afanayo kadokotela, amalensi anenkomba yokukhanya ephezulu akhanya ukukhanya ngendlela ephumelela kakhulu. Ngokwethiyori, lokhu kusho ukuthi kudingeka izinto ezincane zelensi, okwenza kube lula ukukhiqiza imiphetho emincane. Yilapho kuvela khona isimangalo esithi "inkomba ephezulu incane". Kodwa-ke, ukubamba ukuthi lokhu kuyiqiniso kuphela ngaphansi kwesisekelo "sencwadi efanayo kadokotela, uhlaka olufanayo, kanye nomklamo ofanayo." Uma noma yikuphi kwalokhu kuguquguquka kushintsha, isiphetho siyawa.

Okokuqala, ake sixoxe ngesici esiyinhloko esithinta ilensiisisindo: iukuminyana kwezinto zelensi.

Lokhu kuyinguquko ebalulekile abantu abaningi abavame ukuyishaya indiva. Amalensi anezinkomba ezahlukene zokubuka avame ukusebenzisa izinto ezinobuningi obuhlukahlukene, futhi ngokuvamile, lapho inkomba yokubuka iphakeme kakhulu, kulapho ubukhulu bayo buphakama khona. Ukubonisa ngesibonelo esiqondile:

Amalensi e-resin ane inkomba yokubuyisa engu-1.56 babe nobuningi obungaba ngu-1.32 g/cm³;

Amalensi e-resin ane inkomba yokubuyisa engu-1.60 babe nobuningi obungaba ngu-1.36 g/cm³;

Amalensi e-resin ane-index ephezulu ane- inkomba yokubuyisa engu-1.74 finyelela ubuningi obungu-1.47 g/cm³.

Ngamanye amazwi, yize amalensi anenkomba ephezulu engase abe mancane, indwangu ngokwayo iminyene kakhulu. Inzuzo yesisindo etholakala ngokuba mncane cishe incishiswa ukuminyana okuphezulu.

Singenza ukubala okulula kokuqhathanisa (ngokusekelwe emibhalweni efanayo kanye nosayizi wohlaka): Kule lensi eyodwa enenkomba yokukhanya engu-1.60, uma sicabanga ukuthi ubukhulu bomphetho obungu-5mm, ivolumu ingu-10cm³, okuholela esisindweni esingu-1.36 × 10 = 13.6g.

Ilensi enenkomba yokukhanya engu-1.74, ngenxa yenkomba yayo ephezulu yokukhanya, inganciphisa ukujiya komphetho wayo kube ngu-4.2mm kanye nomthamo wayo ube ngu-8.5cm³. Kodwa-ke, isisindo sayo siba ngu-1.47 × 8.5 ≈ 12.5g—kubonakala sengathi ilula, kodwa umehluko awubalulekile.

Uma usayizi wohlaka mkhulu, kudingeka izinto zelensi ezengeziwe, okunciphisa kakhulu lo mehluko wesisindo. Kungase kuholele ngisho nakumalensi "amancane kodwa asindayo" ngenxa yobuningi obukhulu bezinto ezinenkomba ephezulu. Lokhu kuyiqiniso ikakhulukazi kuma-myopia aphansi kadokotela (isb., ama-degrees angu-100-300), lapho inzuzo "yobuncane" yamalensi anenkomba ephezulu isivele ingacaci kangako. Uma ihlanganiswe nobukhulu bayo obuphezulu, isisindo sokugcina singase singahlukaniseki nhlobo nesamalensi anenkomba ejwayelekile.

Othile ku-Bilibili wenze isivivinyo sokuqhathanisa: amandla afanayo kadokotela, ozimele abafanayo, ibanga elifanayo le-pupillary, kodwa ama-refractive indices ahlukene. Lapho amalensi aqediwe ekhiqizwa, ngaphandle komehluko wobukhulu emaphethelweni, umehluko wesisindo wawuncane kakhulu—igremu elilodwa noma amabili nje. Lokhu kukhombisa nokuthi ukuncipha akusho ukuthi kulula kakhulu. (Izinhlobo ezahlukene zamalensi zingahluka kancane.)

Ngale kwenkomba yokubuyisa, usayizi wohlaka futhi isimo inethonya elikhulu nakakhulu esisindweni selensi kune-refractive index uqobo. Abantu abaningi bagxila kuphela kumalensi ngokwawo ngenkathi bengakunaki ukubaluleka kokukhethwa kohlaka. Kule lensi efanayo, ukuyihlanganisa nohlaka olukhulu olune-curve ephezulu kudinga ukunciphisa kancane unqenqema lwelensi, okuholela endaweni enkulu yelensi engasetshenziswa kanye nevolumu enkulu—okwandisa isisindo sayo ngokwemvelo. Ngokuphambene nalokho, ukuyihlanganisa nohlaka oluyindilinga oluncane kudinga ivolumu encane yelensi, okunikeza isisindo esilula.

Isibonelo, uhlaka olukhulu olunobubanzi obungu-60mm oluhambisana namalensi angu-1.74 aphezulu lungase lube nesisindo esingaphezu kohlaka oluncane olunobubanzi obungu-50mm namalensi angu-1.60. Yingakho odokotela bamehlo bevame ukuncoma amafreyimu amancane kulabo abanemithi ephakeme—ukukhetha usayizi wohlaka olufanele kunomthelela oqondile ekunciphiseni isisindo kunokulandela ngokungazi amalensi aphezulu aphezulu.

Ngaphezu kwalokho, i- inqubo yokuklama Amalensi amaningi anamuhla athinta kakhulu ukujiya kwawo kokugcina kanye nesisindo. "umklamo we-aspheric".okunciphisa kakhulu ukujiya komphetho kanye nesisindo ku-refractive index efanayo. Ngokuphambene nalokho, "amalensi ayisiyingi" endabuko angase abe nemiphetho emikhulu kunamalensi aspheric anezinkomba ezijwayelekile zokubuyisa, ngisho noma i-refractive index iphakeme. Ngale kwalokhu, izici ezifana nobukhulu obuphakathi belensi kanye namasu okupholisha umphetho nazo zithonya isisindo esibonwayo. Isibonelo, amanye amabhrendi akhulisa ngamabomu ukujiya okuphakathi kwamalensi anezinkomba eziphezulu ukuze athuthukise ukuqina, okuphinde kube nomthelela ekwandeni kwesisindo okubonakalayo.

Okokugcina, ake sibuyele embonweni wokuqala oyiphutha: "Ingabe inkomba ephezulu yokubuka ukukhanya isho ukuthi amalensi amancane nakhanyayo?" Impendulo ngokusobala ingucha. Inkomba yokubuka ukukhanya imane nje iyisici esisodwa esithinta ukujiya kwelensi, kuyilapho isisindo selensi sinqunywa kakhulu yinhlanganisela yezici ezifaka phakathi ukuminyana kwezinto, usayizi wohlaka, kanye nomklamo welensi. Ukuphishekela ngokungazi inkomba ephezulu yokubuka ukukhanya akugcini nje ngokubeka engcupheni yokuchitha imali kodwa futhi akuqinisekisi ulwazi lokugqoka okulula noma okuncane.