contact lens is a device worn in the eye to correct vision,
although some people wear colored contact lens to enhance or
change their eye color. The thin plastic lens floats on a film
of tears directly over the cornea
Next-generation silicone hydrogel materials are
practice-building tools that offer existing patients a
value-based upgrade performance product. They are based on
the experiences of three eyecare professionals
who worked with the Acuvue Oasys lens in clinical trials.
- In the
early days of contact lens manufacturing PMMA lenses were
produced with equipment of limited accuracy and polishing was
used to give the lens its final surface and geometric quality.
One of the important developments in lens manufacture was the
introduction of high precision lathes
in the early 1990s
raw material for contact lenses is a plastic polymer. (A
polymer is a blend of materials created by linking the
molecules of different chemical substances.) Hard contact
lenses are made of some variant of polymethyl methacrylate (PMMA).
Soft contact lenses are made of a polymer such as poly
hydroxyethyl methacrylate (pHEMA) that has hydrophilic
qualities, that is, it can soak up water and still retain
its shape and optic functions.
contact lenses are mass produced. Spin-cast lenses - A spin
cast lens is a soft contact lens manufactured by whirling
liquid plastic in a revolving mold at high speed, Lathe cut
- A lathe cut contact lens is cut and ground on a lathe ,
Molded , Hybrids .
has been estimated that about 125 million people use contact
lenses worldwide (2%), including 28 to 38 million in the United
and 13 million in Japan .
The types of lenses used and prescribed vary markedly between
countries, with rigid lenses accounting for over 20% of
currently-prescribed lenses in Japan, Netherlands and Germany
but less than 5% in Scandinavia.
contact lens industry has seen an explosion in sales and growth
over the last decade. The colored contact lens
market is leaping forward and grabbing more and more of the
entire contact lens market. The non-prescription colored contact
lens market is gaining size every year.
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