Els lents bifocals contenen dues prescripcions diferents a la mateixa lent. El propòsit principal dels bifocals és proporcionar l'equilibri òptim entre la visió a distància i les necessitats de visió centrant-se d'aprop. Aquests lents estan disponibles amb els segments de lectura en una varietat de formes i amples, incloent opcions d'ulleres de sol. La forma dels bifocals llegir més popular és el Flat-Top (també coneguda com a recta superior o segment D), que és d'uns 28 mm d'ample.

Presbyopia is the normal loss of near focusing ability that occurs with age. Most people begin to notice the effects of presbyopia sometime after age 40, when they start having trouble seeing small print clearly — including text messages on their phone. You can't escape presbyopia, even if you've never had a vision problem before. Even people who are nearsighted will notice that their near vision blurs when they wear their usual eyeglasses or contact lenses to correct distance

Presbyopia is the normal loss of near focusing ability that occurs with age. Most people begin to notice the effects of presbyopia sometime after age 40, when they start having trouble seeing small print clearly — including text messages on their phone. You can't escape presbyopia, even if you've never had a vision problem before. Even people who are nearsighted will notice that their near vision blurs when they wear their usual eyeglasses or contact lenses to correct distance