Cataract surgery involves removing the natural lens of the eye and replacing it with an artificial lens (intraocular lens implant or IOL). The plastic artificial lens is permanent, requires no care, and can significantly improve vision.ataract surgery is indicated when the cataract impairs vision to the extent that it interferes with normal daily activities. Cataract extraction is one of the most frequently performed surgical procedures in the world. A cataract is a cloudy or opaque area in the normally clear lens of the eye.
There are 640 acres in a square mile -- there is no such thing as a square acre. And just in case you are interested, 43560 square feet in an acre. idiot detector Â· 1 decade ago
43,560 sq ft per acre. A square mile is defined as 640 acres. A square mile is 5,280 feet x 5,280 feet, for a total of 27,878,400 square feet. Divide that by 640 to get 43,560 square feet in an acre. square mile is 5,280 feet x 5,280 feet, for a total of 27,878,400 square feet. Divide that by 640 to get 43,560 square feet in an acre.