Page 123 - The Creation Of The Universe

Harun Yahya (Adnan Oktar) 121

which keeps Earth warm.
2) A small amount of ultraviolet light, whose wavelengths are shorter
than visible light and which is necessary for the synthesis of vitamin D
among other things.
3) Visible light, which makes vision possible and supports plant photo-
synthesis.
The existence of a range of "visible light" is as important for the support
of biological vision as it is for photosynthesis. The reason is that it is im-
possible for a biological eye to see any band of the spectrum outside that
of visible light and a very small section of near infrared.
To explain why this should be so, we first need to understand how vi-
sion takes place. It begins with particles of light called "photons" passing
through the pupil of eye and falling onto the surface of the retina located
at the back of the eye. The retina contains cells that are light-sensitive. They
are so sensitive that each can recognize when even a single photon strikes
it. The photon's energy activates a complex molecule called "rhodopsine",
large quantities of which are contained in these cells. The rhodopsine in
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turn activates other cells and those activate still others in turn. Eventually
an electrical current is generated and this is carried to the brain by the op-
tic nerves.
The first requirement for this system to work is that the retina
cell must be able to recognize when a photon strikes it. For that to
happen, the photon must carry an exact amount of energy: if it is too much
or too less, it won't activate the formation of rhodopsine. Changing the size
of the eye makes no difference: the crucial thing is the harmony between
the size of the cell and the wavelengths of the photons coming in.
Making an organic eye that could see other ranges of the electromag-
netic spectrum turns out to be impossible in a world dominated by carbon-
based life. In Nature's Destiny, Michael Denton explains this subject in de-
tail and confirms that an organic eye can only see within the range of vis-
ible light. While other models of eyes that could, in theory, be produced,
none of them would be able to see different ranges of the spectrum.
Denton tells us why: