Human Eye Essay

556 Words2 Pages

The human eye is an organ that allows a person to see, the sense of sight. The eye is composed of several parts including the cornea, lens, pupil, retina, optic nerve etc. There are two portions the eye is broken into, the front third is the anterior segment and the other two thirds is the posterior segment. The anterior segment includes the lens, cornea, iris, and ciliary body. The posterior segment of the eye essentially is the back portion of the eye. In detail, the posterior segment is the portion of the eye behind the lens that includes the retina, macula, optic nerve, choroid, and vitreous humor. There are many diseases that affect the eye and those in particular affecting the posterior segment will be discussed in detail. Some diseases that affect the retina and posterior segment of the eye include diabetic retinopathy, retinal cancer (melanoma), glaucoma, age macular degeneration, and uveitis. Diabetic retinopathy and glaucoma fall under diabetic eye disease. Diabetic retinopathy is the most common diabetic eye disease. It is the damage to the blood vessels in the retina. Gl...

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