Table 2.

Causal relationship of change of atrophic area with visual acuity according to the zone 1 to zone 6

Atrophic area	Correlation coefficient (r)	p-value
Total area	0.10	0.108
Zone 1	0.54	0.021*
Zone 2	0.61	0.010*
Zone 3	0.44	0.032*
Zone 4	0.35	0.099
Zone 5	0.22	0.167
Zone 6	0.18	0.103

Analyzed by analysis of covariance after adjusting for year, initial atrophic area, initial visual acuity, each patient, and patient’s eyes.

^*Statistically significant value p < 0.05.