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ASSESSMENT OF BINOCULAR VISION UTILIZING THE PULFRICH AND VENETIAN BLIND EFFECTS*

ABSTRACT A pendulum swinging and co‐planar with a pair of fixed squares to either side of a fixation point provides a combination of the Pulfrich1 and the Venetian blind effect5 suitable for assessing stereopsis in central and peripheral vision. The Venetian blind effect provides a very sensitive test of central stereopsis while the Pulfrich pendulum provides a test of peripheral stereopsis. The use of a colored filter to induce the phenomena provides the ability to differentiate responses by eye. Five categories of response to the pendulum have been identified. Responses to the Venetian blind effect may supplement or complement the findings with the pendulum. The utility of the test results for treatment is undetermined though understanding the complexity of the patient's problem could significantly modify both the practitioner's prognosis and the patient's expectations.