Ngokwezilinganiso zeWorld Health Organization (WHO), isibalo sabantu abaphethwe yi-myopia sinjaloenkulu kunazo zonkephakathi kwabantu abanamehlo amancane, futhiinefinyelelaed2.6 billion ngo-2020. I-Myopia isiyinkinga enkulu yomhlaba wonke, ikakhulukazie-Asia. Izinga le-myopia e-China lingama-47.1%, cishe isigamu senani labantu.Kusho eyodwakubo bonke abantu ababili ubona eduze.
I-Myopia Rate Emazweni Ahlukene
Namuhla,ngeukwanda okuphawulekayo kwezinga le-myopia, izingaegqokeizibuko nazo ziyanda unyaka nonyaka.Njengenye yei-myopiciziguli, have wenaunake isicisukuthi deqeda iikhwalithi yelensi uma ucabangelaisoukugqoka umklamo kanye nomsebenzi welensi?
Ake sifunde okuthileebalulekilet mayelana iimpahla yelensi kanye nenkomba ye-refractive.
Ilensi enhle idinga ukufana,ukudlulisakanye nokucaca. TI-lens evame kakhulu namuhla ingumphumela weminyaka yokuhlola.
| Ukuthuthukiswa kwezinto zamalensi Amalensi amaningi okuqala enziwa ngesandla ngezinto zemvelo ezifana ne-quartz nekristalu. Ngokuthuthukiswa kokukhiqizwa kwengilazi kanye nobuchwepheshe bezimboni, izinto zemvelo zashintshwa ngokushesha ingilazi ye-optical eyaqala ukunikeza imisebenzi eyengeziwe. Kusukela ngeminyaka yawo-1960 kuya ko-1980, izinto ze-resin, ezenziwe nge-petroleum, sezithathe indawo yengilazi ngezindawo zayo ezingcono zokubona, ukucubungula okuphephile kanye nezakhiwo ezingokomzimba ezincane, futhi zaba yizinto eziyinhloko zamalensi engilazi yamehlo kuze kube manje. |
Njengezinto ezithandwa kakhulu zamalensi emakethe, izinto ze-resin zimelelwa ikakhulukazi yi-CR-39 resin eyakhiwe yi-PPG, i-MR resin eyakhiwe nguMitsui,futhiI-resin ye-KR yakhiwe yi-KOC, Korea, njll.
I-lens inquma inkomba ye-refractive yelensi. Inkomba ye-refractive ye-Lens isilinganiso sejubane lokusabalalisa ukukhanya ku-vacuum kuya ekukhanyeni kwesivinini sokusabalalisa kokokusebenza kwelensi, okubonisa ikhono lokuhlehla lelensi ekukhanyeni. Ngokuvamile, ukuphakama kwe-refractive index ye-lens, i-lens iba mncane.
Okwamanje,I-Universe Opticalinenkomba ye-refractive engu-1.50, 1.53, 1.56, 1.60, 1.67, 1.74 nokunyeizinkomba zeamalensi. Mayelana nezinto zokwakha, siye salondoloza ukubambisana okuseduze kwe-PPG yase-United States kanye ne-Mitsui Chemical yase-Japan.kanye neezinye izinkampani zezinto zokusetshenziswa ezinempumelelo evelele.
CR-39 impahla eluhlaza ethengwe kwa-PPG, e-USA, isetshenziselwa ukwenza i-refractive index 1.50 lens.Ithandwa kakhulu emakethe bngenxa ye-coefficient yayo ephezulu ye-Abbe, ukusebenza kahle kwe-optical, ukusebenza kokuphephafuthiengabizi kakhulu.
I-1.53 refractive index lens ithathwe kwinto ekhethekile, i-Trivex, nayo evela ku-PPG yase-US. I-Trivex lens impahla imelana ngokwedlulele. Ngoba alula kunamalensi ajwayelekile, amalensi e-Trivex anjalokuhle kakhuluukukhetha kwezingubo zamehlo zezingane, okokugqoka kwamehlo angenazinsimbi, izibuko zezemidlalo, okokuvikela amehlo, kanye nezingubo zamehlo zezemidlalo.
Ngeukuthuthukiswa oizibuko ze-f, "i-lens", njengesisekeli esiyinhloko sezibuko, ihlala isungula futhi ithuthukisa ngokushintsha kwezikhathi.UmkhathiI-Optical 1.60, 1.67, 1.74phezuluinkombaIzinto zokusetshenziswa zamalensi zenziwe ngochungechunge lwe-MR lweMitsui Chemical. MR uchungechungeizinto ezisezingeni eliphezulu nezithuthukile, ezinenkomba ephezulu yokuphinda iphinde iphindeke, inombolo ye-Abbe ephezulu, amandla adonsela phansi akhethekile, ukumelana nomthelela omkhulu nezinye izinzuzo.
Ukuthuthukiswa okuqhubekayo kwezinto zamalensiI-R&Dkanye nobuchwepheshethuthukisaumkhiqizo welensisokushaion. I-lens eluhlazanquma iukuzinzayekhwalithi, ukudlulisa, ukucaca kanye nomphumela obonakalayo.
Umkhathii-optical ibilokhu ibambelela kunqubomgomo yokubambisana ngokuwina kanye nokuzuza ngokubambisana. Thinalalela izwi lamakhasimende,Funa ukwaziikhasimendes'izidingo, naka imaketheukuthambekela, Ngakho keukwakha umbono ocacile.