Abbott Medical Optics conducted a 250-eye study of the Tecnis multifocal intraocular lens (IOL) and measured results at three days, 30 days, 90 days, 150 days and 210 days after cataract surgery. Most of the study participants achieved their best vision after 180 days, which the researchers called a neuroadaptation period. During the last checkup, 96.8 percent of eyes could read at 20/20 (J2) without correction, with 83.2 percent reading at 20/15 (J1).