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. 2021 Oct 28;62(13):28. doi: 10.1167/iovs.62.13.28

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Copyright 2021 The Authors

This work is licensed under a Creative Commons Attribution 4.0 International License.

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Figure 4. — Variation of the growth rate of GA and area affected by GA in four quadrants within the ETDRS grid. The radius of the center circle was 0.5 mm, and the radius of the outer circle was 3 mm. (A) We determined the local GA BERs in each quadrant of the ETDRS grid among eyes with GA involving all four quadrants (n = 137 eyes). Local GA BERs did not differ significantly across the four quadrants based on the Friedman test (P = 0.23). (B) Similarly, the growth rate of GA area (n = 137 eyes) did not differ significantly across the four quadrants based on the Friedman test (P = 0.27). (C) At the baseline visit of all included eyes (237 eyes), the GA area was significantly different across the four quadrants of the ETDRS grid based on the Friedman test (P = 0.002). The GA area was significantly higher in the temporal than in the nasal quadrant (P = 0.02) and was significantly higher in the superior than in the inferior quadrant (P = 0.01).