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. Author manuscript; available in PMC: 2010 Dec 1.
Published in final edited form as: Optom Vis Sci. 2009 Dec;86(12):1337–1345. doi: 10.1097/OPX.0b013e3181be9d9c

Figure 6.

Figure 6

Within-visit repeatability of modified bell retinoscopy (67 cm retinoscope measures). Bland-Altman plot of inter-measurement differences in lag estimates (67 cm retinoscope measures; second measure minus first measure) plotted against the mean of two measurements. Dashed lines: 95% limits of agreement from stratified analysis, for mean lag above and below 0.50 D; inner dotted line: bias function; outer dotted lines: linear functions describing 95% limits of agreement as a function of mean lag; open symbols: screening cohort; filled symbols: clinic cohort. Note that scale of x-axis differs from Figure 5.