Patients with DM had bilateral cataract surgery with a 2.8 or 3.0 mm scleral incision , a capsulorhexis with a diameter of approximately 5.0 or 6.0 mm , and implantation of a 6.0 mm optic ( Eternity X-60 ) or 7.0 mm optic ( Eternity X-70 ) IOL .