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Formal visual fields are a key tool for assessing chromatic vision. Part one of the series covered how they are performed. In this video, you will learn how to interpret the data produced by formal visual field testing, also known as perimetry. The Humphrey visual field analyzer is the most commonly used instrument for this. Patients are tested on static thresholds, with their heads in a white ball perimeter and instructed to maintain fixation while detecting white dots. Each data point on the results sheet represents a visual threshold in the field of vision.