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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 4.

Figure 4

Repeatability of modified bell retinoscopy as a function of age and refractive error. Bland-Altman plots of differences in lag estimates (standardized 40 cm target estimates; second estimate minus first estimate) plotted against age (Panel A), cylindrical refractive error (axis 90 degrees) (Panel B), and spherical equivalent refractive error (Panel C), for the screening cohort. Middle dotted lines: bias functions; outer dotted lines: linear functions describing 95% limits of agreement as a function of age or refractive error.