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  Indian J Med Microbiol
 

Figure 4: An example of our method for calculating the ischemic index. The total fundus area was encircled, and the area of nonperfusion was delineated. Ischemic index was the ratio of the area of nonperfusion over the total fundus area

Figure 4: An example of our method for calculating the ischemic index. The total fundus area was encircled, and the area of nonperfusion was delineated. Ischemic index was the ratio of the area of nonperfusion over the total fundus area