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Cataract surgery, also called lens replacement surgery, is the removal of the natural lens of the eye that has developed a cataract, an opaque or cloudy area. The eye's natural lens is usually replaced with an artificial intraocular lens (IOL) implant.
Cataract surgery is not readily available in many countries, and surgery is needed only if the cataracts are causing problems and generally results in an improved quality of life. About 20 million people worldwide are blind due to cataracts.
In his book, An Anthropologist On Mars (1995), neurologist Oliver Sacks recounts the story of Virgil, a man who saw very little until having cataract surgery at age 50. Virgil's subsequent behavior was that of a "mentally blind" person—someone who sees but cannot decipher what is out there; he would act as if he were still blind.
Cataracts are a leading cause of blindness. Viral video made by YouTube star Jimmy Donaldson, known as MrBeast, shows patients getting vision restored for free.
Cataract surgery is the removal of the natural lens of the eye that has developed a cataract, an opaque or cloudy area. Over time, metabolic changes of the crystalline lens fibres lead to the development of a cataract, causing impairment or loss of vision.
The most common causes of visual impairment globally are uncorrected refractive errors (43%), cataracts (33%), and glaucoma (2%). [1] Refractive errors include near-sightedness, far-sightedness, presbyopia, and astigmatism. [1] Cataracts are the most common cause of blindness. [1]
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