VI. Diphtheria and Influenza—Crossed Eyes

One must remember that the flu actually has its origin in an ailment of the brain. You will have perceived that a flu patient is always in a kind of doze, because the most important areas of the brain under the optic nerve are numbed. Thus he comes to doze. Now you can also grasp that when paralysis is located in the upper sections of the brain, the point of the intersection of the optic nerves is affected and the person sees double. All this shows you that double vision can come about quite naturally in influenza.