Question #4c13f

1 Answer
May 26, 2017

The human eye is a three-layered, globular structure with two compartments.

Explanation:

The human eye is a globular structure, comprised of two segments, the anterior and the posterior.

As a single unit, it has three layers: the outer fibrous sclera and cornea; the middle vascular choroid that continues into the ciliary body, pigmented epithelium, and iris, and the inner retina (found only in the posterior segment).

The anterior chamber comprises, from outward in, the transparent cornea, the aqueous humour (a transparent fluid), the iris, and the transparent lens.

The posterior chamber comprises, from inward out, the vitreous humour (a jelly-like substance that maintains eye pressure), the retina (which has light-capturing cells termed the rods [for low light] and cones [for bright light and colour]), the vascular choroid , and the tough fibrous and protective sclera.

At the rear of the eyeball is the optic nerve which transmits signals received by the rods and the cones to the brain where it is interpreted as sight.
http://www.ivyroses.com/ogimages/HumanBody/HumanBodyEye_anatomy-eye.jpg