Utomoni ndi mankhwala omwe ali ndi phenolic. Lens ya utomoni ndi kulemera kopepuka, kukana kutentha kwambiri, kukana kukhudzidwa sikosavuta kuthyoka, kusweka kulibenso m'mphepete ndi ngodya, kotetezeka, kumatha kutsekereza kuwala kwa ultraviolet, lens ya resin ndi mtundu womwe mumawakonda kwambiri anthu a myopia pakadali pano.