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As,
discussed earlier, A contact lens is a foreign,
plastic object placed on the ocular surface, therefore,
patients must be instructed properly in effective lens
care & in the necessity of follow-up visits.
A
contact lens may be considered to be an optical patch
& bandage. As a patch it reduces the availability
of oxygen and the dissipiration of carbon dioxide from
the cornea. As a bandage it creates pressure on the
underlying tissue & reduces wetting of the ocular
surface & dissipation of material from between the
contact lens & the cornea.
Dry
eye is the leading cause of contact lens discomfort
or intolerance. Soft contacts in particular, rapidly
evaporates the tears from the eye, causing irritation,
protein deposits, infection and pain.
Contact
lenses may become contaminated with organic & inorganic
deposits, & become scratched, clipped or ripped.
This lead to corneal edema.
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