Emashumini ambalwa eminyaka adlule, ama-lensi aqinile akwenziwa kuphela nge-polymethylmethacrylate noma ingilazi. Abaphuthelwa i-oksijini futhi babengakhululekile ukugqoka, ngoba kwakudingeka baphethwe njalo futhi baphathwe abahlanza okhethekile. Namuhla, amalensi okuxhumana aqinile akhiwe ngezinto ezikhiqizwa ngesisekelo se-silicone. Banekhono eliphakeme lokugesi futhi babe nezimfanelo eziningi ezinhle.
Izinzuzo zama-lensi ezinzima
Amalensi okuxhumana amancane okulungiswa kombono anenzuzo enjalo:
- Ukuguqulwa - kusukela ukuthi izinto ezenziwe kuzo zinzima kangakanani, zibambe ngokuphelele isimo.
- Ukuzinza kwesithombe - le mikhiqizo ayifuni lapho icula, ngakho isithombe sihlale sicacile.
- Ukuphikisana namaprotheni ama-deposit - ayamelana nezinto ezifika ebusweni bawo kusuka ekukhuleni kwamanzi, ngakho-ke isikhathi sokugqoka okuphephile nokukhululekile kwama-lensi sikhula kakhulu.
- I-diameter encane - lokhu kwenza indawo yangaphandle ye-peripheral ye-cornea ivuleke kakhulu ukuthola ukufinyelela kwe-oksijini kanye nezinyembezi ezizohlanza amaseli afile nezinhlayiyana ezincane zangaphandle.
- Ukuguqulwa - isikhathi sokuphila kwanoma yikuphi ubusuku obunzima namalensi wesikhashana kunqunyelwe kuphela izinguquko embonweni womsebenzisi.
Ngaphezu kwalokho, le optics yokulungisa ayinamanzi. Awomile emoyeni noma eshisayo, okukuvumela ukuthi ungasebenzisi amaconsi okumswakama.
Kungcono nini ukugqoka amalensi aqinile?
Kwezinye izimo, ama-lens aqinile,
- ukulungiswa kwe-orthokeratological;
- i- astigmatism ebizwa ngokuthi (uma ukulungiswa okudingekayo ngamalensi athambile akukwazi ukufezwa);
- ukubuka isikhathi eside;
- i-keratoconus (isifo se-corneal, lapho sipholile khona noma siphelile).