Sleep Deprivation Has No Effect on Dynamic Visual Acuity in Military Service Members Who Are Healthy

Matthew R. Scherer; Pedro J. Claro; Kristin J. Heaton

doi:10.2522/ptj.20120144

Figures

Figure 1.

Change in mean group yaw dynamic visual acuity (DVA) values from time 1 to time 2 (test-retest stability) obtained under rested conditions. Change in mean group yaw DVA values from time 2 to time 3 reflect 26 hours of supervised sleep deprivation (sleep deprivation protocol). Solid line represents active DVA values; dashed line represents passive DVA values. Error bars characterize the collective variance (standard deviations) for measurements at each time point. The Snellen eye chart equivalent scores follow the LogMAR score in parentheses. Note visual acuity is better than 20/20 in all cases. Statistical significance of time effect is denoted with open bracket (P=.0004). As a point of reference, note that functional yaw-plane DVA deficits in patients with vestibular hypofunction have been measured in the range of LogMAR=0.3–0.4, per the findings of Herdman et al.³⁶ PY=passive yaw, AY=active yaw.

Figure 2.

Change in mean group dynamic visual acuity (DVA) values from time 1 to time 2 (test-retest stability) obtained under rested conditions. Change in mean group pitch DVA values from time 2 to time 3 reflect 26 hours of supervised sleep deprivation (sleep deprivation protocol). Active, downward-directed (AD) head impulses are depicted with the thin solid line; passive, downward-directed (PD) impulses are depicted with the dashed line; active, upward-directed (AU) impulses are depicted with the bold solid line; and passive, upward-directed (PU) impulses are depicted with the stipple-circle line. Error bars characterize the collective variance (standard deviations) for measurements at each time point. The Snellen Eye Chart equivalent to the LogMAR score is depicted in bold below. Note visual acuity is better than 20/20 in all cases. Statistical significance of time effects is denoted with open brackets. As a point of reference, note that functional yaw-plane DVA deficits in patients with vestibular hypofunction have been measured in the range of LogMAR=0.3–0.4, per the findings of Schubert et al.²⁸