Progressiveadditionlenses 161031155105
Progressiveadditionlenses 161031155105
Progressiveadditionlenses 161031155105
Near
A designated zone in the lower portion of the
lens, which provides the necessary near
addition or near power.
Intermediate
A corridor in the central portion of the lens
connects these two zones, which increases
progressively in plus power from the distance
to near. This zone is also known as
“progressive zone”.
BASIC DESIGN DIFFERENCE BETWEEN
PROGRESSIVE, SINGLE VISION, BIFOCAL
AND TRIFOCAL LENSES