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
Hi Lisa, One mile is 5280 feet is 1/4 mile is 5280/4 = 1320 feet. Thus a square which is 1/4 mile on each side has an area of 1320 2 = 1742400 square feet. There are 43,560 square feet in one acre so a 1/4 mile square is 1742400/43560 = 40 acres.