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
How many acres in a section? An acre measures 43,560 square feet which is roughly 208.71 feet on a side. A section (one square mile) measures 27,878,400 square feet. Divide 27,878,400 by 43,560 and that equals 640 acres in a section. A half (1/2) section is 320 acres.