RLE stands for refractive lens exchange.  Also called clear lens exchange, RLE is essentially cataract surgery [insert link to cataract surgery video] performed on a clear lens or mild cataract.  The natural lens is replaced with an IOL (intraocular lens), with can be single focus or multifocal, correcting for distance and near vision. RLE has the advantage of being able to treat presbyopia as well as extreme myopia or hyperopia.