Progressive Glasses - optical4u.com
Prescription glasses with progressive lenses allowing multiple vision fields to be incorporated into a single lens without any clear distinction between the fields themselves. The power in the lenses "progressively" changes from far-to intermediate to your full reading power. This is why progressive lenses are often referred to as "no-line" bifocals, trifocals, No-line multifocals.
Progressives are intended for people who need correction for Presbyopia, but do not want a hard line in the middle of their lenses.
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