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You and I are humans.
And the human eye is no less than a wonder.
It is only in humans that the eye acts as a window into the individual mind.
But the first thing first!
Later, we'll be going into the finer details of it.
Let's begin.
At the biological level, eye anatomy deals with the parts of the eye.
Look for various different types of eye diagrams - all together under one roof!
(I decided to put them all together on one single page; so that you can easily select one out of many for the particular purpose and usage you have.)
You'll find the eye ball containing three coats.
The outer coat consists of sclera and cornea.
The middle coat consists of the iris, the ciliary body and the choroid. In the center of the iris, there is an aperture, called the pupil.
The iris contains pigments determining eye color in the human eye. In the Caucasians and Nordiks, the concentration of the pigment is meager and hence the persons have a blue eye. Likewise there is brown eye, green eye, or an eye color hazel too.
A very important function of the ciliary body is that the ciliary processes secrete the aqueous humor, continuously forming and draining it through the canal of Schlemn (SVS). Blocking of this drainage in the human eye leads to rise of intraocular eye pressure, which is a common symptom of glaucoma.
A clear fluid flows continuously in and out of the anterior chamber and nourishes nearby tissues. The fluid leaves the chamber at the open angle where the cornea and iris meet. When the fluid reaches the angle, it flows through a spongy meshwork and leaves the eye:
One of the most important structures of the human eye, called the crystalline lens, is situated in between the iris in front and vitreous humor behind.
The inner coat, called the retina, is an extension of the brain through the optic nerve. The end organs of vision - rods and cones - are called photo receptors.
Little lateral to the optic disc (the point of exit of the optic nerve) lies the macula. The central part of the macula is called the fovea centralis and is the seat of the most acute vision in the human eye.
A perfectly healthy human eye can see only one part of everything it looks at, the best; and all other parts relatively worse than that. Such an eye is said to have the most acute vision through central fixation.
A human eye with any kind of vision problems (which most people have - whether apparent or latent) - loses this central fixation and gets rather economically fixated. The only way out is to get that central fixation back (possible!) through vision therapy.
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