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Cataract surgery is one of the most cost-effective health interventions, since its economic benefits considerably exceed the cost of treatment. [ 128 ] [ 129 ] The 1998 World Health Report estimated 19.34 million people were bilaterally blind due to age-related cataracts, and that cataracts were responsible for 43% of all cases of blindness.
Cataract surgery, using a temporal approach phacoemulsification probe (in right hand) and "chopper" (in left hand) being done under operating microscope at a Navy medical center A cataract is an opacification or cloudiness of the eye's crystalline lens due to aging, disease, or trauma that typically prevents light from forming a clear image on ...
[42] [53] In some developed countries, a trend to overuse cataract surgery has been noted, which may lead to disappointing results. [54] Phacoemulsification is the most widely used cataract surgery in the developed world. [55] [56] This procedure uses ultrasonic energy to emulsify the cataract lens.
PCO is a common side-effect of many cataract surgeries and is easily treatable with a one-time laser capsulotomy procedure (see below). Accommodating IOLs interact with ciliary muscles and zonules , using hinges at both ends to "latch on" and move forward and backward inside the eye using the same nerves and musculature as normal accommodation.
Early symptoms may include strong glare from lights and small light sources at night and reduced visual acuity at low light levels. [4] [5] Couching (lens depression) was the original form of cataract surgery and was used from antiquity. Chrysippus of Soli, a stoic Greek philosopher, provided the earliest account of it. [6]
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Early symptoms may include strong glare from lights and small light sources at night and reduced visual acuity at low light levels. [3] [4] During cataract surgery, the cloudy natural lens is removed from the posterior chamber, either by emulsification in place or by cutting it out. [2]
Cataract surgery by “couching” (lens depression) is one of the oldest surgical procedures. The technique involves using a sharp instrument to push the cloudy lens to the bottom of the eye. Perhaps this procedure is that which is mentioned in the articles of the Code of Hammurabi (ca. 1792–1750 BC) though it is a mere speculation.