Bifocal Contact Lenses
Contact Lenses for People over Age 40
For anyone over the age of 40, the reality of the need for bifocals is impending. However, not
everyone is ready to share it with the world! Bifocal contact lenses offer visual freedom, at both
distance and near, without line bifocals and without bulky glasses. Through the years, bifocal
contact lenses have even developed to the point where they are available as
daily contact lenses,
giving you the even greater freedom of being picky about the bifocal contact lenses that you choose.
Bifocal contacts are available as both soft contacts and rigid gas permeable contacts.
Bifocal Contact Lens Designs
There are a few different designs of bifocal contact lenses. The two basic concepts can be
categorized into (1) simultaneous vision, and (2) alternating vision. The simultaneous vision design
is by far the most popular and the most comfortable. The lenses have an aspheric design similar to that
in no-line bifocals (aka. progressives, or
PALs). The key feature with simultaneous vision
contacts is their dependence of pupil size. The amount of light that the pupil allows into the eye
will determine the power of the lens. Anyone who has small pupils that don't respond adequately to
changes in distance and to changes in light levels will not be successful in simultaneous vision
bifocal contacts.
The alternating design works similarly to line bifocals in that there is a specific
portion of the contact lens designated for distance lens power, and a separate part of the lens that
contains the power needed for a person to see clearly at near. In order to provide good vision, these
lenses should not rotate on the eye, so they must be either truncated or thick on the bottom
(prism-ballasted), or both. This makes the lenses slightly less comfortable.
Buy Discount Bifocal Contact Lenses!
Disclaimer
The information provided by KnowYourEyes.com is intended for educational purposes only and in no way
replaces the advice and diagnosis of a licensed eye care professional. KnowYourEyes.com disclaims any
and all liability for injury or other damages that may result from use of the information obtained
from this website.
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