1st EE & 2nd EE were welding/grinding single sand screw to mend it. 1st EE was under sand screw to weld when 2 EE began grinding causing sparks & debris to fly towards 1st EE. 1st EE removed self until 2nd EE finished. 1st EE was in full PPE; face shield safety glasses gloves hard hat & fall protection. EE reported it on 2/19. Diagnosed with conjunctivitis & prescribed eye drops.