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Retinal pigment epithelium: This layer lying betwen the retina and choroid, contains melanocytes that make for its characteristic black color. This pigment allows the inside of the eye to absorb stray rays of light like the black paint inside a camera or within a dark room.he eyes are housed in protective bony structures of the skull called the orbits. Each eye is composed of a tough outer layer, the sclera and cornea; a middle layer, the choroid, ciliary body and iris; and the inner layer of nerve tissue called the retina.
The visible part of the eye is protected by the eyelids and the eyelashes, which keep dirt, dust, and even harmful bright light out of the eye. Our eyes are also protected by our tears, which moisten the eyes and clean out dirt, dust, and other irritants that get past the defenses of our eyelashes and eyelids.