Page 22 - The Book Pi in eye

Rajesh Khanna, MD

Refraction is the study of the focusing power of the eye. Refractive
implies the manipulation to correct the errors of refraction of the eye,
in this case surgical intervention. Lens Exchange means, removing the
dysfunctional lens and replacing it with a newer synthetic
biocompatible lens pi (Presbyopic Implant), which allows the eye to
see near, middle, and far. Biocompatible means, that the body will
tolerate it and not develop any allergies nor reject the new lens.
Prelex can therefore be defined as exchanging an improper
functioning old natural lens with a newer artificial inert lens Pi, which
can help us see at all distances and decrease or even eliminate
dependency on glasses or contact lens.

How long has Prelex been around?

This new technology has evolved over the last five decades. Over
the past seven years millions of implants have been implanted in
patients all across the United States. The author alone has implanted
thousands of them, with incredible results.
The alignment of various fields of science has culminated into a
new and exciting technology. It is the product of the merger between
cataract surgery and Lasik.
It originated before Lasik but was handicapped by lack of
methods to take out the non working lens through a small wound,
and ability to refine results. Nano engineering helped develop
advanced lenses, which are used in the procedure. This procedure has
been around for a few decades but has reached a higher level of
sophistication and patient satisfaction only in the 21st century.

What are Cataracts?

Our hair grows longer every year and finally turns grey. Likewise,
new layers of cells and fibers are added to the natural lens every year.
We can get a haircut and maintain the volume of our hair.
Unfortunately the lens fibers have nowhere to go. The new layers
envelop the older layers. Therefore, the lens increases in volume and
it becomes harder and less pliable. It becomes lees efficient at
adaptation. Finally as the ageing process continues, it starts turning
yellow or white. This discoloration affects the transmission of light
and is termed cataract. Cataract is a Greek word meaning waterfall. It

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