Contact Lenses Trifocal

contact lenses
(contact lens) A thin lens, made of flexible or rigid plastic, that is placed directly on to the eye to correct vision, used as an alternative to spectacles, or, if coloured, to change one's eye color cosmetically
(Contact lens) A small plastic disc containing an optical correction that is worn directly on the cornea as a substitute for eyeglasses.
A thin plastic lens placed directly on the surface of the eye to correct visual defects
(contact lens) contact: a thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication

trifocal
(Trifocals) Lenses containing three focal lengths, usually arranged with the focus for distance above, intermediate distance in the middle, and near vision below.
(trifocals) Spectacles with corrective lenses that have three different powers per eye
(of a pair of glasses) Having lenses with three parts with different focal lengths
Trifocals are eyeglasses where the lenses have 3 regions to correct for distance, intermediate (arm's length), and near vision. They are mostly used by people with advanced presbyopia who have been prescribed 2 diopters or more of reading addition.