Eye injuries on construction sites are mainly caused by not wearing eye protection or wearing the wrong type of protection. Common hazards that can injure eyes include dust, sparks, wires, and chemicals. The document provides examples of eye injuries from sparks and wire brushes that occurred because no eye protection was worn. It recommends wearing safety glasses for general work, goggles if working in dusty conditions, and both safety glasses and a face shield if grinding, cutting, or welding. Proper care and replacement of eye protection when scratched or damaged is also advised to protect workers' eyes.