The pupil, in the normal eye, gets smaller when looking at a distant object, and
larger when looking at something close by.
Interestingly enough, the pupil also changes size according to the emotions. When
you look at someone you love very deeply, or something that gives you great
pleasure, the pupils get larger. When you look at something you don’t
like at all, they get smaller!
So now you have a way to know ‘who loves ya baby’!
Right behind the Iris is the Crystalline Lens, which receives the light as it passes
through the Pupil and focuses it upon the Retina, just like you did as a child when
you used a magnifying glass to focus the sun onto a piece of paper.
Connected to the Crystalline Lens by a tiny ligament, is the Ciliary Muscle, which
controls the contraction and expansion of the Crystalline Lens. In other words, the
Ciliary Muscle changes the shape of the eye’s lens and therefore changes your
focus.
The third, Inner Layer, or Retina, is a continuation of the Optic Nerve, which is
located at the back of the eye. Actually, it’s a direct outgrowth of the brain!
The Retina receives the light that is focused upon it by the lens and then sends
signals to the brain. The brain interprets the signals and you ‘see’ the image of the
outside world! Neat huh!