Employee using a saw to cut trees and brush. Did not feel anything hit his face or eyes, but later felt an irritation in his left eye. He washed his eye out at 9:30 pm on 6/18 and at 5:00 am on 6/19. He the reported to plant management and was taken for med attn. It is possible that when he wiped his brow with his glove that he may have wiped the piece of rust into his eye.