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The general impression seems to be that the subjective symptoms of headache, vertigo, etc., are secondary to the nystagmus, but the grouping of the symptoms, as they occur in individual cases, allows of another interpretation.
1Physical injuries, especially to the eyes or head, may be followed by the onset of neurotic symptoms plus nystagmus.
2In cases where nystagmus previously existed, injury to, or a foreign body in an eye aggravates the condition even long after the attendant conjunctivitis has cleared up.
3The symptoms are aggravated by drawing the patient's attention to them.
4Nystagmus may first be noticed at the outbreak of a neurosis.
5When the neurotic symptoms intervene in a case of nystagmus hitherto free from symptoms other than giddiness, vertigo, and blepharospasm, etc., these latter symptoms are incorporated amongst those of the neurosis.
6The nystagmus group of symptoms passes imperceptibly into the anxiety group. Tremors of the hands follow those of the head and become generalized on excitement or exertion. Finally tachycardia, hyperidrosis, etc., follow.
7The ocular oscillations are experimentally inseparable from other tremors that may be present.
8In some cases, in the course of psycho-analysis, the nystagmus took part in an abreaction.