The development of new contact lenses is an important technological
breakthrough and this branch of science is still expanding with
tremendous growth. Contact lenses are a successful form of vision
correction, used by approximately 90 million people worldwide. One
of the challenging problems encountered by this community is
Opacification or loss of optical transparency of the contact lens
materials. The tear components like chlorides of sodium and
calcium, phosphates, glucose, lipids, proteins etc., may interact
and diffuse into the lens material. This will certainly bring about
a change in lens structure and its properties. The particular
property of great importance in lenses is the refractive index,
which is directly related to polarizability of the lens material.
Since refractive index 'n' of lens material is the major criteria
in determining power of the lens, slightest change in
polarizability can change the refractive index and hence the power
of the lens. It is well established that Positron Lifetime
Spectroscopy (PLS) is the best and sensitive probe of electron
density distribution in a system of study.
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