Figure 10 shows the power of the LFC (0.0–0.6 Hz), MFC (0.6–0.9 Hz) and HFC (1.0–1.4 Hz) for the EMMs and MYOs while viewing the square wave targets. Statistics show that, as with the accommodation microfluctuations, there was no significant change in the power of any of these components in either refractive group as the SF of the square wave targets altered (LFC, EMMs: ANOVA,
F 5, 72 = 0.730,
p = 0.604; LFC, MYOs: ANOVA,
F 5, 72 = 0.601,
p = 0.699; MFC, EMMs: ANOVA,
F 5, 72 = 0.500,
p = 0.775; MFC, MYOs: ANOVA,
F 5, 72 = 0.824,
p = 0.538; HFC, EMMs: ANOVA,
F 5, 72 = 0.331,
p = 0.892; HFC, MYOs: ANOVA,
F 5, 72 = 1.050,
p = 0.398). There was a significant difference in power between the frequency components (ANOVA,
F 2, 432 = 102.539,
p < 0.001), with the LFC having significantly greater power than the MFC and HFC (Scheffe post hoc,
p < 0.001 for both comparisons). There was no significant difference in power between the MFC and HFC (Scheffe post hoc,
p = 0.327).