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Amalensi okukhanya ampunga e-Bifocal Photo angu-1.56 aqediwe kancane
Ngokuvamile, izibuko ze-myopia ezishintsha umbala azigcini nje ngokuletha ubulula nobuhle kodwa futhi zingamelana ngempumelelo ne-ultraviolet kanye nokukhanya, zingavikela amehlo, isizathu sokushintsha kombala ukuthi lapho ilensi yenziwe, ixutshwa nezinto ezizwela ukukhanya, njenge-silver chloride, i-silver halide (eyaziwa ngokuthi i-silver halide), kanye nenani elincane le-copper oxide catalyst. Noma nini lapho i-silver halide ikhanyiswa ukukhanya okunamandla, ukukhanya kuzobola futhi kube yizinhlayiya eziningi zesiliva ezimnyama ezisatshalaliswa ngokulinganayo kulensi. Ngakho-ke, ilensi izobonakala ifiphele futhi ivimbele ukudlula kokukhanya. Ngalesi sikhathi, ilensi izoba nombala, okungavimbela kahle ukukhanya ukufeza injongo yokuvikela amehlo.
