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. Author manuscript; available in PMC: 2014 Apr 1.
Published in final edited form as: Ophthalmology. 2013 Jan 26;120(4):724–730. doi: 10.1016/j.ophtha.2012.09.056

Figure 1.

Figure 1

The change in Mean Deviation (MD) since the previous visit, ΔMD, for visual fields measured during each month (January, February, March, April, May, June, July, August, September, October, November, December) for each of the six geographical zones (Atlantic, Central, North, Pacific Northwest, Southeast, and West). For each month, the black circle represents the mean, with vertical lines extending to the 95% confidence interval for the mean. If a significant seasonal effect was found in that zone, it is shown by a red line.