Blindness is defined as a lack of vision or loss of vision which eyeglasses or contact lenses cannot correct. Legally blind or partial blindness means a person has very limited vision. There are many causes of blindness that range from being born blind to an eye injury, or having an eye condition. Other eye conditions in the family of blindness are called night blindness, a condition making it difficult to see in low light, and color blindness which is the inability to tell some colors from others. Color blindness affects more boys than girls.
Common causes in the United States for blindness are:
Glaucoma – A disease that affects the pressure of fluid in the eyeball. An intraocular pressure increase puts a person at significant risk of developing glaucoma.
Macular Degeneration – This is usually a condition the elderly are inflicted with. Macular Degeneration is a loss of vision in the central portion of the visual field because there is damage to the retina.
Amblyopia – Also known as "lazy eye". An amblyopic eye that otherwise seems healthy, but has a loss of vision for no apparent reason.
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