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1.56 Ubururu bukozwe muri Photochromic Gray HMC Optical lenses
Indorerwamo ni ibikoresho bibonerana bifite ubuso bumwe cyangwa bwinshi bugonze bukozwe mu bikoresho by'urumuri nka ikirahure cyangwa resin. Nyuma yo gusigwa, akenshi iteranywa mu birahuri bifite icyuma cy'ikirahure kugira ngo ikosore uburyo bwo kureba bw'umukoresha no kubona neza.
Ubunini bw'ikirahuri bushingiye ahanini ku gipimo cyo kugarura urumuri n'urugero rw'ikirahuri. Ikirahuri cya myopic kiba gito hagati kandi gifite ubunini ku nkengero, mu gihe ikirahuri cya hyperopic kiba gitandukanye. Ubusanzwe uko ikirahuri kiba kinini, ni ko ikirahuri kiba kinini; Uko ikirahuri cya refractive kiba kinini, ni ko ikirahuri kiba gito.
