Fig. 4

Average visual field defects for yellow protocol for a last migraine longer ago than 60 days before testing, and b last migraine within 7 days or less. Before averaging across data for eyes and pupils the z-scores were converted to a 24–2 format to make the results more comparable to standard perimetry. Data from right eyes were flipped to resemble left eyes so that corresponding parts of the fields could be averaged. Hence, while the data from 10 and 19 subjects were used for a and b, respectively, the actual number of fields averaged in each figure was 40 and 76 as this included fields for both eyes and both pupils. Despite 76 fields being averaged b shows a consistent inferior-temporal scotoma. The blue protocol data showed no consistent scotomas