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
Best Answer: An acre is approximately 211 ft x 211 ft it is a square unit of measure. One acre comprises 4,840 square yards, 43,560 square feet. A mile is 5,280 ft long it is a linear unit of measure. If you want to know measurements of an acre in square miles it is 211/5280 x 211/5280 square miles. An acre is much much smaller than a square mile. If you want to know how many acres in a square mile take the inverse of that small number 1/x.