Page 18 - The Book Pi in eye

Rajesh Khanna, MD

adventurous that fly, sky dive, parasail, or climb mountains clear
vision is of paramount importance. Precise eye coordinated activities
such as knitting, sewing, needlepoint, analyzing jewelry or machinists
require quality binocular near vision.

What is Presbyopia?

Presbyopia is the inability of the old, thick, resistant lens, to
change shape and focus power. The lens is part of the eye that brings
the light to focus. It is included in the membrane called the lens
capsule. On the inner surface of the lens capsule there are specialized
cells. These cells generate new fibers throughout life; similar to how
our hair grows on our scalp. Unlike the hair that can be trimmed or
cut, there is no way to remove the old fibers. So in turn, the lens
becomes fatter and less pliable. At the same time the muscles
involved in the movement of the lens become weaker and have less
space to function because of the thicker lens.

Figure 2.2 In Presbyopia the eye is unable to focus on near
objects.

This condition usually begins around the age of 40. As the years
go by, there is an increased difficulty in reading small print, reading
time on wristwatch, operating computer or cell phone. It worsens
progressively over the next twenty years until around age sixty, when
intermediate vision is lost: this includes difficulty watching television

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