Vision is one part of the balance system. The brain has to process, compile and make sense of self movement
as well as movement in the environment using visual, vestibular and somatosensory information. Previous
research has shown visual information reduction causes performance measures to decline in many physical
tasks. Monocular blur is quite common, having several causes, some even voluntary. It is important to know if
monocular blur causes any decreases in accurately interpreting the moving world, potentially impacting
balance and safety. This research’s aim was to investigate whether a decrease in visual information with
monocular blur is measurable as a change in dynamic visual acuity (DVA), even in relatively young and
healthy populations; and whether this altered visual information also causes postural instability (i.e. increases
sway). Participants were tested using the inVision™ system by NeuroCom, Intl.
(http://www.resourcesonbalance.com), while standing on a force platform, BASIC Balance Master
®
, made by
the same company. The inVision™ system accurately measures DVA in logMAR and the Balance Master
measures postural sway in deg/sec. All DVA measurements-static visual acuities, target following acuities, and
head shaking acuities- were taken with or without monocular blurring spectacles. Simultaneously, sway
readings were taken during each of the DVA conditions. It was expected that static binocular acuities would
have little change with monocular blur, and there would be decreased acuities in both target following and
head shaking measures. However, the static acuities were the most significantly different with blur than
without (p=0.000), followed by the moving target acuities (p=0.001), but not head moving acuities. Sway
measures were expected to increase with blur in all three conditions, especially during the increasingly
challenging, target following and head shaking, dynamic viewing conditions. Yet, the sway measures did not
significantly increase in all conditions. Only with the head moving condition was there a statistically
significant increase (p=0.021). While the significant results were not as expected in all conditions of both
categories of vision and sway, there was a measurable decrease in some performances in each category of this
younger healthier population. As age increases, so do the risks of monocular blur and balance deficits. Further
studies with older populations and those at greater risks for falls need to be done to better understand the
risks associated with monocular blur.
Vision is one part of the balance system. The brain has to process, compile and make sense of self movementas well as movement in the environment using visual, vestibular and somatosensory information. Previousresearch has shown visual information reduction causes performance measures to decline in many physicaltasks. Monocular blur is quite common, having several causes, some even voluntary. It is important to know ifmonocular blur causes any decreases in accurately interpreting the moving world, potentially impactingbalance and safety. This research’s aim was to investigate whether a decrease in visual information withmonocular blur is measurable as a change in dynamic visual acuity (DVA), even in relatively young andhealthy populations; and whether this altered visual information also causes postural instability (i.e. increasessway). Participants were tested using the inVision™ system by NeuroCom, Intl.(http://www.resourcesonbalance.com), while standing on a force platform, BASIC Balance Master®, made bythe same company. The inVision™ system accurately measures DVA in logMAR and the Balance Mastermeasures postural sway in deg/sec. All DVA measurements-static visual acuities, target following acuities, andhead shaking acuities- were taken with or without monocular blurring spectacles. Simultaneously, swayreadings were taken during each of the DVA conditions. It was expected that static binocular acuities wouldhave little change with monocular blur, and there would be decreased acuities in both target following andhead shaking measures. However, the static acuities were the most significantly different with blur thanwithout (p=0.000), followed by the moving target acuities (p=0.001), but not head moving acuities. Swaymeasures were expected to increase with blur in all three conditions, especially during the increasinglychallenging, target following and head shaking, dynamic viewing conditions. Yet, the sway measures did notsignificantly increase in all conditions. Only with the head moving condition was there a statisticallysignificant increase (p=0.021). While the significant results were not as expected in all conditions of bothcategories of vision and sway, there was a measurable decrease in some performances in each category of thisyounger healthier population. As age increases, so do the risks of monocular blur and balance deficits. Furtherstudies with older populations and those at greater risks for falls need to be done to better understand therisks associated with monocular blur.
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