<unk>  are eyeglasses whose corrective lenses each contain regions with two distinct optical powers.<unk>  are most commonly prescribed to people with presbyopia who also require a correction for myopia, hypermetropia, and/or astigmatism.
Bifocals
Cadaver
Maleic anhydride
Vinyl bromide
Cyborg
Firefighter
Biricodar
Alloplant