![]() Postural stability was measured under conditions of binocular refractive blur of 0, 1, 2, 4, and 8 D and with cataract simulation. Measurements were repeated with four visual targets with high (8 cyc/deg) or low (2 cyc/deg) spatial frequency and high (Weber contrast, ∼95%) or low (Weber contrast, ∼25%) contrast. Data were collected under normal standing conditions and with somatosensory system input disrupted. Postural stability was determined as the root mean square of the center of pressure (COP) signal in the anterior–posterior (A-P) and medial–lateral directions and LLA was determined as the ratio of the average body weight placed on the more-loaded limb to the less-loaded limb, recorded during a 30-second period. Thirteen elderly subjects (mean age, 70.76 ± 4.14 years) with no history of falls and normal vision were recruited. To determine the influence of cataractous and refractive blur on postural stability and limb-load asymmetry (LLA) and to establish how postural stability changes with the spatial frequency and contrast of the visual stimulus.
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