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The authors study concerned the relationship of counter-rolling in human eyes to vestibular function. For this study a modification of Nagels instrument consisting of a headband, a celluloid plate for measurement of the dislocation, and an axis that conjugates the headband and celluloid plate was used to measure the angle of dislocation of Mariottes' blind spot. This modification of Nagels' instrument can move with the angle of examinees' head, thus obtaining a more accurate measurement.A total of 53 individuals were examined during this study. Of this total 36 were without complaint and 17 had symptoms of vestibular disorder. The results of this study are as follows:If r is the value of the counter rolled angle of the right eye when the head was declined from 60° right to 60° left and l is the value of the left eye, the following rule will apply.(1) In normals and individuals with bilateral vestibular disorder:0≤|r-l/r+l|≤0.15(2) In unilateral disorders:0.16≤|r-l/r+l|≤1.00The ballance in relation to muscle tonus is equal in normals and those affected bilaterally. In unilateral disorders the ballance in relation to muscle tonus is remarkably affected.

MEASUREMENT OF COUNTER-ROLLING IN HUMAN EYES IN RELATIONSHIP TO MARIOTTES BLIND SPOT