Page 40 - Miracle in the Eye

MIRACLE IN THE EYE

signs as wrongdoers:
Who could do greater wrong than someone who is reminded of the
signs of his Lord and then turns away from them, forgetting all that
he has done before?... (Qur'an, 18: 57)

Adjusting to Brightness and Dark
You can test for yourself all the details about the eye we have described
up to this point. When you first enter a dark room, it's difficult to distinguish
different objects within. This is because at that moment, your retina's level of
sensitivity is very low. But this sensitivity can multiply itself by a factor of
ten times in less than a minute, allowing your retina to respond to gleams
only a tenth as powerful as before. In twenty minutes, the retina can adjust
itself 6,000 times, and in forty minutes, nearly 25,000. The eye can increase its

(Figure 1.13). A diagram of the muscles that are triggered upon
orders from the brain, and can either contract or relax to change
the pupil size. This way, a constant intensity of light always enters the eye.
The second diagram to the right depicts the same muscles, but magnified.