The major symptoms of hysteria : fifteen lectures given in the Medical School of Harvard University [between the fifteenth of October and the end of November, 1906] . isual field on whichwe ought to be able to dwell for a long time. You knowthat human sight, owing to the dimensions of the retina,extends over a certain surface. The extent of the sur-face an eye can see simultaneously, without moving,is called the visual field. No doubt all the points ofthis definition should be discussed. It is not quite cer-tain, in particular, that all the points of the visual fieldare seen simultaneously in
The major symptoms of hysteria : fifteen lectures given in the Medical School of Harvard University [between the fifteenth of October and the end of November, 1906] . isual field on whichwe ought to be able to dwell for a long time. You knowthat human sight, owing to the dimensions of the retina,extends over a certain surface. The extent of the sur-face an eye can see simultaneously, without moving,is called the visual field. No doubt all the points ofthis definition should be discussed. It is not quite cer-tain, in particular, that all the points of the visual fieldare seen simultaneously in a single act of attention;but this definition is practically sufficient. If youmeasure the visual field of a normal subject with thoseinstruments which are called campimeters and perim-eters, the description of which would be too long, youobtain the following figure, which I have presented toyou in this picture of the visual field of the right eye,R, in Figure 13. The field has the form of an irregularcircle, more extended on the external and on the in-ferior sides, where it measures almost oo°, which meansthat the angles formed by the fixation point, the eye. 196 The Troubles of Vision 197 for vertex, and the limit of the visual field, is of circle is narrowed on the internal and superiorsides, where it is barely 6o°; this very natural diminu-tion is due, as you may guess, to the obstacle formedby the nose and the eyebrows. Well, if you examine the visual field of hystericals,you will recognize a very remarkable fact, which verylikely exists only in this neurosis; the visual field isnarrowed concentrically. The extent of the simul-taneous vision becomes smaller; the field is almostcircular at 300 or 200, as you see in the left eye of thefigure 13. Sometimes the field has only io° or 50,and nothing is left but the fixation point. It is true thata disease of the retina, pigmentary retinitis, and perhapsalso certain forms of chronic glaucoma, give rise to ananalogous p
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