Page 11 - The Book Pi in eye

Pi in eye

The front part of this layer is called the iris and it is what gives color
to the eye. The iris is behind the clear cornea. The innermost and
most delicate layer is the neurosensory retina. In fact this layer is an
extension of the brain. This layer converts the light energy into
electrical signals, which are then transmitted to the occipital lobe or
back of the brain.

Figure 1.1 Structure of the human eye.

The light beam from the sun is the ultimate power source of all.
The photons from the sun traverse millions of miles, get reflected
from objects, and then ultimately enter our eyes. The photons
stimulate receptors, which are like computer chips, generating electric
signals. The maximum numbers of receptors are located in the area
of the retina known as the macula.
If the photons converge to a point in front of the retina then the
patient is nearsighted. Likewise, if the photons are not brought to
focus at all, this is defined as farsightedness. In astigmatism the
photons are brought to focus at different points in the eye. The
function of refractive surgery is to ensure that the maximum number
of photons of solar energy are brought to the receptors without a loss
of the encoded information.
The optic nerve and its pathways carry the signals to the occipital

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