as "one-size-fits-all" doesn't always fit, neither does one pair of
eyeglasses for all situations.
you want optimum vision and comfort for a specific activity, such as computer
use, work, hobbies or driving, or you need glasses that provide an extra margin
of safety for work or recreation, special-purpose eyeglasses will usually meet
these needs better than your “everyday” glasses.
you spend much time in front of a computer, you probably already know that eye strain,
fatigue and muscle strains are common problems associated with prolonged
computer use. “Computer glasses” have lenses that are specially-designed to
maximize your vision at the intermediate and close-up distances you use during
computer work. Computer-specific eyewear will give you the best correction for
these distances and help reduce eyestrain.
Reading and hobbies
If you wear bifocals,
you may find you have to tip your head back slightly to use the reading portion of the lens.
That’s fine for most things, but if you want to sit and read a novel, this
head-back posture can cause neck discomfort and fatigue. Often, a pair of
single vision reading glasses are a much better solution for prolonged reading
and other detailed near vision tasks, such as sewing or needlepoint work.