In acute demon possession, the eyes are affected very markedly. They are forced to see evil things, and bad things, so much so that they affect the person, and make him fidgety and complaining; the eyes cannot look straight in another's face, nor, indeed, look at anything without an "attack" of some kind, produced by the spirits of evil. These attacks may cause the person to look guilty in the eyes of others, when there is no ground for doing so.
There are two kinds of concentration:
1) Physical, through the eyes, and
2) mental, by the mental vision.
The man himself is only acting in any action of the body, when concentration of mind and will is at the back of his every action. Visions may be physical, mental or spiritual. In the physical vision the eyes are needed; in the mental, the eyes of the mind; and in the spiritual the inward vision of the spiritual man.
When evil spirits control the physical eyes, visions of supernatural, and natural beings, and things, appear before them, and in ordinary matters of life things appear different from what they really are. The man receives impressions of things contrary to reality, such as the panel of a door appearing like a cross, lights in the sky in various figures, etc. The man declares he "sees" these things, but he does not know that evil spirits can present them to his vision.
The eyesight of necessity is affected by this manipulation of the eyes, and there are general feelings of weakness. Things look misty and blurred, and undefined. There may be short-sightedness, and inability to concentrate on any small object; concentration of the eyes is painful and difficult, the man complains of the light, tiredness of the eyes, and dark spots appear before them, either stable or moving, near or far; symptoms which might be looked upon as purely physical if it were not for the supernatural element accompanying them.
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