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: There are 640 acres to a square mile. So an acre is ((5280)^2 / 640 square feet. That comes out to 43,560 square feet to an acre. When we take the square root of 43,560 we will know the length of one side of the acre. That is ~ 208.710 feet. Four times that will be the perimeter.