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formal visual fields are a powerful diagnostic tool to assess the panorama of a chromatic vision part one of this series showed you how they are performed in this video you will learn how to interpret the data produced by formal visual field testing also called perimetry you are looking at a display a visual field static thresholds obtained by testing a patient on the Humphrey visual field analyzer the instrument in most common use in the world today the patients head was placed in a white ball perimeter with an appropriate lens correction for viewing at 1/3 meter the patient was instructed to maintain fixation on a central area and to press a buzzer when he or she detected a white dot briefly displayed somewhere on the bull each display spot was retested until a stable visual threshold was docHubed that established how bright the test spot had to be before the patient consistently detected it on the results sheet each data point represents a visual threshold in the field of vision fo