Computer Glasses
Any eyeglass that focuses at around 28 inches can be used
for the computer, but only glasses specifically designed for computer
use are referred to as computer glasses.
Both trifocals and weak bifocals can be used but with limitations. Since
the computer portion of these glasses is at the bottom of the lens, and
most moniters are at eye level, the head must be tilted back to see thru
the computer portion. Since this is not a natural head position, it only
takes a few minutes for the neck muscles to tighten up and cause a stiff
or sore neck.
Computer glasses are more like reading glasses in that the whole lens
focuses at the same distance and does not require you to tilt back your
head to see the computer screen properly.
Unfortunately most reading glasses don't work well for
the computer because they focus at around 14 inches, and the computer
is nearly twice that
distance from
the eyes causing the computer screen to be out of focus. To bring the
monitor into focus you would have to lean forward. This unusual position
usually causes the back muscles to tighten up resulting in a sore back
shortly thereafter.
Rather than lean forward any longer some will lean back
to relieve the strain in their back. Since the screen is now out of
focus they will
squint their eyes in an attempt to see better. This squinting causes
pressure and tightness around the eyes which can lead to eye strain headaches
and wrinkles at the outer corner of the eyes call crows feet.
The solution is to use special computer glasses which look just like
regular glasses. If you already wear regular distance glasses, you can
use clip on computer glasses to wear over your regular glasses when using
the computer.
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