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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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