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Cataracts affect nearly 22 million Americans age 40 and older. By age 80, more than half of all Americans have cataracts. Direct medical costs for cataract treatment are estimated at $6.8 billion annually. [72] In the eastern Mediterranean region, cataracts are responsible for over 51% of blindness.
Over time, natural changes in the lens of your eye cause the tissue within the lens of each eye to break down and clump together, creating cloudy areas that affect vision. Traumatic cataract: As ...
The primary causes include post-cataract surgery, certain medications, and, less commonly, neurological or ophthalmological conditions. Post-cataract surgery is a common cause, as replacing the natural lens with a synthetic one increases exposure to blue light, leading to temporary blue-tinted vision. This effect usually resolves as the eye adapts.
Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception.In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [6]
Cataracts are the main cause of blindness in Africa, and affect approximately half of the estimated seven million blind people on the continent, a number that is expected to increase with population growth by about 600,000 people per year. As of 2005, the estimated cataract-surgery rate was about 500 operations per million people per year.
Early symptoms of cataract may be improved by wearing appropriate glasses; if this does not help, cataract surgery is the only effective treatment. [4] Surgery with implants generally results in better vision and an improved quality of life : however, the procedure is not readily available in many countries.
Cataract surgery is the removal of the natural lens of the eye that has developed a cataract, an opaque or cloudy area. [3] Over time, metabolic changes of the crystalline lens fibres lead to the development of a cataract, causing impairment or loss of vision.
A minority of patients may regain low or moderate visual acuity, but over 70% are left clinically blind with worse than 20/400 vision. [4] A Nigerian study showed other complications include secondary glaucoma, hyphaema, and optic atrophy. [5] Couching does not compare favourably to modern cataract surgery.