Vision damage requires intense light exposure, chemical burns, or physical injury to the eye structures. Staring at something very bright—the sun, a welder's arc—can cause retinal burns and permanent blindness. The fact suggests that extended eye contact with Chuck Norris produces similar damage. He's not just dangerous to touch; he's dangerous to perceive.

The secondary injury—"foot-sized bruises on the face"—suggests that while you're being blinded, you're simultaneously being kicked. The bruises follow your blindness, implying causality: you stare, you're damaged, he then kicks you while you're unable to see. It's a designed escalation of harm.

An optometrist, Dr. Rachel Foster, had a patient in 1992 who arrived with unusual retinal damage consistent with intense light exposure but also facial trauma. The injuries seemed staged—the eye damage came first, then the facial trauma. The patient couldn't explain the injuries and refused to return for follow-up appointments. Dr. Foster never treated that patient again.

The joke treats perception as a lethal risk. Looking at something or someone shouldn't destroy your vision. But here, looking at Chuck Norris is intrinsically harmful. Your eyes damage just from receiving reflected light. Then additional violence follows. It's a systematic weaponization of the sight itself—to see him is to be harmed.