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Options for the Bifocal
User
Contact lenses are generally designed to correct the
distance vision, leaving the eye itself to focus
additionally for near vision. However, as people age, the
focusing ability of the eye gradually declines. Usually in
the early forties, this becomes noticeable, and reading
material has to be held further away to be able to focus
on it. Eyestrain symptoms and headache can occur. In
people who do not use contact lenses, a bifocal prescribed
in glasses can eliminate any problems with reading.
However, what options are available for contact lens users?
Reading Glasses
This is the simplest option for reading with contact
lenses in: using reading glasses over top of the lenses.
However, most contact lens users prefer to avoid glasses
use, and it may be difficult to keep up with a pair of
reading glasses when the distance vision is clear with
contact lenses.
Monovision
This refers to using one eye for distance vision, and one
eye for near vision. Usually the non-dominant eye is set
for reading (usually the left eye). Advantages of this
system include the ability to read and see at distance
without glasses using relatively inexpensive contact
lenses. Disadvantages include a loss of depth perception
and the possibility of eyestrain symptoms. Some people are
simply not comfortable with this arrangement.
Bifocal Contact Lenses
A bifocal contact lens can be used in one or both eyes to
maximize both near and distance vision. Unfortunately,
sometimes clear reading vision comes with some sacrifice
of clear distance vision. Probably on 50% of people
successfully use bifocal contact lenses, and they are
among the most expensive of contact lenses.
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