Approximately 27 million Americans
wear contact lenses. The majority use these devices
to correct vision as an alternative to glasses. Approximately
85% use soft lenses because of the superior comfort
they provide. Contact lenses fit over the cornea, the
transparent outter coating of the eye. Soft lenses are
made of hydrophilic (water loving) plastics that absorb
fluid. When these materials soak up water, they become
supple and soft. The water content can vary from 37%
to 80%. Soft lenses are used to correct nearsightedness
(myopia), farsightedness (hyperopia), and some degrees
of astigmatism. Soft lenses may also be prescribed following
cataract surgery for vision correction.
