Fig. 35. A. Pure localized loss. There is an inferior visual field defect with similar number of probability symbols in both the total and pattern deviation maps. There is a very significant corrected pattern standard deviation with a borderline significant mean deviation. Note that the mean deviation becomes significant even with pure localized defects when the defect is extensive. B. Photograph of this patient's right optic nerve shows thinning superiorly causing the inferior field defect.