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Trifocal lenses
are part of the multi-focal lens family most commonly
used to accommodate
presbyopia patients. The trifocal lens offers
three fields of vision, which include distance,
intermediate and near. The higher the
ADD power on a RX
prescription, the more notable the intermediate range is
for the viewer. As the successor of the bifocal the
trifocal consist of an added segment for a near field of
vision like the bifocal, but also has a segment directly
above to address an intermediate field of view. The
trifocal lens may be an alternative to the progressive
lens. Unlike the progressive lens the trifocal has a
clear peripheral view with most materials, and also
offers an intermediate visual range. The trifocal is
offered in different segment sizes, which include 7X25,
7X28, 7X35, 8X35 and an executive style lens (also known
as an e-style lens). See samples below. |
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