Stepping accuracy and visuomotor control among older adults: effect of target contrast and refractive blur

Black, Alex A.; Kimlin, Janessa A.; Wood, Joanne M.

doi:10.1111/opo.12141

Cited by 18 publications

(12 citation statements)

References 29 publications

(43 reference statements)

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“…As double glazing door frames are ever-present in home environments, superimposing high-contrast black and white vertical stripes on each face (riser) of the door frame could improve safety within the home. The high contrast of the obstacle top-edge may also help stepping accuracy, particularly under blurred conditions such as with multifocal wear (Black, Kimlin, and Wood 2014).…”

Section: Discussionmentioning

confidence: 99%

The addition of stripes (a version of the ‘horizontal-vertical illusion’) increases foot clearance when crossing low-height obstacles

et al. 2015

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Citation: Foster RJ, Buckley JG, Whitaker D and Elliott DB (2016) The addition of stripes (a version of the 'horizontal-vertical illusion') increases foot clearance when crossing low-height obstacles, Ergonomics. 59(7): 884-889. The authors thank Georgia Halstead for her help during data collection. AbstractTrips over obstacles are one of the main causes of falling in older adults, with vision playing an important role in successful obstacle negotiation. We determined whether a horizontal-vertical illusion, superimposed onto low-height obstacles to create a perceived increase in obstacle height, increased foot clearances during obstacle negotiation thus reducing the likelihood of tripping. Eleven adults (mean±1SD: age 27.3±5.1 years) negotiated obstacles of varying heights (3, 5, 7 cm) with four different appearance conditions; two were obstacles with a horizontal-vertical illusion (vertical stripes of different thickness) superimposed on the front, one was a plain obstacle and the fourth a plain obstacle with a horizontal black line painted on the top-edge. Foot clearance parameters were compared across conditions. Both illusions led to a significant increase in foot clearance when crossing the obstacle, compared to the plain condition, irrespective of obstacle height. Superimposing a horizontal-vertical illusion onto low-height obstacles can increase foot clearance and its use on the floor-section of a double-glazing door frame for example, may reduce the incidence of tripping in the home. Practitioner summaryLow-height obstacles such as the floor-section of a double-glazing door frame are potential tripping hazards. In a gait lab-based study we found that a horizontalvertical illusion superimposed onto low-height obstacles led to significantly higher foot clearances; indicating their potential as a useful safety measure.

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Section: Discussionmentioning

confidence: 99%

The addition of stripes (a version of the ‘horizontal-vertical illusion’) increases foot clearance when crossing low-height obstacles

et al. 2015

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“…argue that magnification effects associated with lens wear affect judgements of the position and size of raised surfaces, such as steps, and that hazard may therefore occur when prescriptions are changed or not worn. Black et al . conclude that refractive blur from multifocal spectacle corrections can have an adverse effect on stepping accuracy, this being indirectly supported by Supuk et al …”

Section: The Prevalence Of Uncorrected Presbyopia and The Impact Of Cmentioning

confidence: 87%

Virtual Issue Editorial: Presbyopia – grappling with an age‐old problem

Charman

2017

Ophthalmic Physiologic Optic

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“…A key challenge in this area is to develop reliable and valid metrics for measuring the ability to complete the everyday tasks as was outlined in many of the articles in a previous Feature Issue ‘The role of vision in everyday activities’. It is therefore pleasing to see Stanley & Hollands and Black et al . rising to this challenge, outlining methodologies which allow exploration of the link between walking and gaze patterns and the potential link with the risk of falls which are a major cause of mortality in older adults.…”

mentioning

confidence: 94%