Human Eyes are important organs that detect light and allow light to enter it and project onto retina, at the rear of the eye, and then send signals along the optic nerve to the visual areas of the brain. The eye includes a lens that is very similar to lenses of optical instruments such as cameras. The muscles around the iris can relax or tighten the pupil to regulate the amount of light that enters the eye.

Every parts of the eyes may be disordered, thus different kinds of eye diseases occurred. The WHO divided eye diseases mainly into several parts. Cataract and glaucoma are two of the most common eye diseases, the former one is due to the opaque of lens, and the later eye disease is belong to optic neuropathy.

The eye disease of disorders of sclera, cornea, iris and ciliary body, including scleritis, keratitis, corneal uler, snow blindness – a painful eye disease caused by exposure of bright light, corneal neovascularization, fuchs’ dystrophy, keratocunus, Keratoconjunctivitis sicca – an eye disease usually called dry eyes, iritis, and uveitis.

Other eye diseases are disorders of choroid and retina. For instance, retinal detachment – a kind of eye disease refers to the detachment of retina from the choroid, retinoschisis, hypertensive retinopathy, diabetic retinopathy, retinopathy, retinopathy of prematurity, age-related macular degeneration, macular degeneration, retinitis pigmentosa, and macular edema.

Floaters is an eye disease dur to the disorders of vitreous body and globe with shadow-like shapes appare sometimes in the field of vision.

When ocular muscles are out of control, many common eye diseases arise, such as strabismus, progressive external ophthalmoplegia, esotropia, exotropia, hypermetropia, myopia, astigmatism, anisometropia, presbyopia and internal ophthalmoplegia.

Many eye diseases belong to visual disturbances, for example amblyopia – an eye disease also called lazy eye, scotoma, color blindness, achromatopsia and nyctalopia.

Blindness is the most severe eye disease in which the brain can’t receive optical information.

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