Freud, in his paper on Psychogenic Disturbances of Vision, distinguished between conversion symptoms in the realm of the eye, that is, functional disturbances which express a repressed instinctual conflict in a distorted form, and 'neurotic disturbances' which are an organic result of psychogenic attitudes. Harrington, without quoting this old paper of Freud, stresses the same fundamental differentiation when distinguishing between 'hysterical' phenomena in the realm of the visual apparatus, and 'psychosomatic' phenomena, while discussing ciliary spasm and photophobia. In addition, eye symptoms may be a part of a general 'combat fatigue'.