Manual of mental and physical tests : a book of directions compiled with special reference to the experimental study of school children in the laboratory or classroom . FIG. 41. MADDOX TEST FIG. 42. MADDOX TEST FIG. 43. MADDOX TESTFOB VERTICAL DEVIA- FOB VERTICAL DEVIA- FOB VEETICAL DEVIA-TION ; OBTHOPHORIA. TION ; RIGHT HYFER- TION ; LEFT HYPER-PHORIA. PHOBIA. Stevens stenopaic lens (Fig. 44) may be substituted for theMaddox rod. A single determination then suffices for bothhorizontal and vertical displacement. In orthophoria, thecandle flame appears in the center of a diffused disc of light;

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Manual of mental and physical tests : a book of directions compiled with special reference to the experimental study of school children in the laboratory or classroom . FIG. 41. MADDOX TEST FIG. 42. MADDOX TEST FIG. 43. MADDOX TESTFOB VERTICAL DEVIA- FOB VERTICAL DEVIA- FOB VEETICAL DEVIA-TION ; OBTHOPHORIA. TION ; RIGHT HYFER- TION ; LEFT HYPER-PHORIA. PHOBIA. Stevens stenopaic lens (Fig. 44) may be substituted for theMaddox rod. A single determination then suffices for bothhorizontal and vertical displacement. In orthophoria, thecandle flame appears in the center of a diffused disc of light;in heterophoria, it is displaced to the right or left, above orbelow, or obliquely, in a manner corresponding to that of theMaddox line-and-flame test (Fig. 45). The stenopaic lens con- 180 SENSOEY CAPACITY sists of a convex lens of 13 D., covered, save for a very smallopening in the center. The principle is again that of FIG. 44. STEVENS STENOPAIC TEST WITH PRISMS Apparatus.—Trial frame. Four prisms, one of 2, one of 8,and two of 20 prism-diopters, of the circular pattern fitted forthe trial Candle. Meter stick.

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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectpsychophysiology