"MS 1059 Intra/Extracapsular Cataract IOL Implantation Set" refers to a surgical instrument set specifically designed for performing cataract surgery, where the clouded natural lens of the eye is removed and replaced with an artificial lens called an Intraocular Lens (IOL), allowing for both "intracapsular" (within the lens capsule) and "extracapsular" (partially removing the lens capsule) techniques depending onthe patient's needs; "MS 1059" is likely a product code from a particular medical device manufacturer.