Trifocals lenses have the distance prescription power on upper portion of lens, a lined segment with reading prescription power on bottom portion and an intermediate (computer distance) prescription power in middle portion.
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About Polycarbonate Lenses:
Polycarbonate lenses are tough, shatter-resistant, lightweight and ideal for everyday wear.
Recommended for prescriptions of + / - 4.00 and below.
Ten times more impact resistant than plastic.
Filters 100% of UV in daylight and fluorescent lighting.
Comes with scratch resistant coating.