A Quick Lesson in Eye Anatomy
The normal healthy eye is almost spherical and is made up of three layers:
1. The Outer Layer (Sclera)
2. The Middle Layer (Choroid)
3. The Inner Layer (Retina)
The Sclera is opalescent, which means it has
“a milky iridescence like that of an
opal”!!
Its center is transparent and is called the Cornea. Light comes through the
cornea.
Behind the cornea, the second layer, or Choroid is visible. The Choroid Layer
contains tiny blood vessels which transport blood to and from the eyes. When we
do our exercises, one of our aims is to increase this blood flow, to get more oxygen
and nutrition to the eyes, and also to remove waste products.
The Choroid layer contains the Iris (the part of the eye that is colored), with the
Pupil in its center.
The Iris is like a circular muscle that expands and contracts to adjust the size of the
pupil. This lets more or less light into the eye, and helps us to see perfectly,
whatever the lighting conditions (or at least it does in a healthy eye).