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- Eyes and Eye Conditions Quiz
- Patient Comments: Blindness - Causes
- Patient Comments: Blindness - Diagnosis
- Patient Comments: Blindness - Legally Blind
- Find a local Eye Doctor in your town
- Blindness facts
- What is blindness?
- When is one considered legally blind?
- What are the different types of blindness?
- What causes blindness?
- What are risk factors for blindness?
- What are signs and symptoms of blindness?
- What specialists treat blindness?
- How do health-care professionals diagnose blindness?
- What are treatments for blindness?
- What is the prognosis for blindness?
- Is blindness preventable?
Quick GuideCommon Eye Problems and Infections
What causes blindness?
The many causes of blindness differ according to the socioeconomic condition of the nation being studied. In developed nations, the leading causes of blindness include ocular complications of diabetes, macular degeneration, glaucoma, and traumatic injuries. In third-world nations where 90% of the world's visually impaired population lives, the principal causes are infections, cataracts, glaucoma, injury, and inability to obtain any glasses. In developed nations, the term blindness is not used to describe those people whose vision is correctable with glasses.
Infectious causes in underdeveloped areas of the world include trachoma, onchocerciasis (river blindness), and leprosy. The most common infectious cause of blindness in developed nations is herpes simplex. Other causes of blindness include vitamin A deficiency, retinopathy of prematurity, blood vessel diseases involving the retina or optic nerve including stroke, infectious diseases of the cornea or retina, ocular inflammatory disease, retinitis pigmentosa, primary or secondary malignancies of the eye, congenital abnormalities, hereditary diseases of the eye, and chemical poisoning from toxic agents such as methanol.
What are risk factors for blindness?
A principal risk factor for blindness is living in a third-world nation without ready access to modern medical care. Other risk factors include poor prenatal care, premature birth, advancing age, poor nutrition, failing to wear safety glasses when indicated, poor hygiene, smoking, a family history of blindness, the presence of various ocular diseases and the existence of medical conditions including diabetes mellitus, hypertension, cerebrovascular disease, and cardiovascular disease.
What are signs and symptoms of blindness?
All people who are blind or have visual impairment have the common symptom of difficulty seeing. People with similar levels of visual loss may have very different responses to that symptom. If one is born blind, there is much less adjustment to a non-seeing world than there is for people who lose their vision late in life, where there may be limited ability to cope with that visual loss. Support systems available to individuals and their psychological makeup will also modify the symptom of lack of sight. People who lose their vision suddenly, rather than over a period of years, also can have more difficulty adjusting to their visual loss.
Associated symptoms, such a discomfort in the eyes, awareness of the eyes, foreign body sensation, and pain in the eyes or discharge from the eyes may be present or absent, depending on the underlying cause of the blindness.
A blind person may have no visible signs of any abnormalities when sitting in a chair and resting. However, when blindness is a result of infection of the cornea (the dome in front of the eye), the normally transparent cornea may become white or gray, making it difficult to view the colored part of the eye. In blindness from cataract, the normally black pupil may appear white. Depending on the degree of blindness, the affected individual will exhibit signs of visual loss when attempting to ambulate. Some blind people have learned to look directly at the person they are speaking with, so it is not obvious they are blind.