REMOVAL AND CARRYING ELECTRIC MOTOR WT APPROX. 70 LBS TO PUT ON PALLET TO TRANSPORT TO MAINT. SHOP EE DID NOT SEE WHERE EDGE OF CONCRETE PAD ENDED, STEPPING ON EDGE WITH RIGHT FOOT, CAUSING RI GHT FOOT TO ROLL SIDEWAYS FRACTURING ANKLE. HE SAID HE HAS TROUBLE WITH BIFOCALS JUDING DEPTH PERCEPTION.