The eye is formed by three concentric (circular) tunics or layers of tissue. These are the outer fibrous tunic, the middle vascular tunic and the inner nervous tunic. The fibrous tunic is the outermost layer of the eye and is made up of the sclera (the white of the eye) and the cornea (the transparent covering of the front of the eye). The interior of the eye is divided into three chambers or compartments referred to as the anterior (front) chamber, posterior (back) chamber and vitreous chamber. The anterior chamber is located between the cornea and the iris, and contains aqueous humor (a clear fluid produced by the ciliary body).
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