Critical injury is injury that needs immediate medical emergency assistance or first aid. This injury places life in jeopardy, may produce unconsciousness, may involve the fracture of a leg or arm or amputation of a leg, arm, hand or foot and can results in substantial loss of blood.
According this blindness is not an example of a critical injury. All other options are.
may involve the fracture of a leg or arm or amputation of a leg, arm, hand or foot