Visual Processing and Mobility Performance in Visually Impaired Adults

Kuyk, Thomas; Elliott, Jeffry L.; Biehl, John; Fuhr, Patti S.

doi:10.1097/00006324-199512001-00012

Cited by 6 publications

(11 citation statements)

References 0 publications

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“…Through dependent t-tests Kuyk and Elliot (1999) found 41 veterans with AMD in decreased illumination who increased mean travel time, but also increased participant collisions with route obstacles and discovered field of vision and contrast ability predict mobility performance. These results echo similar findings produced by Kuyk et al (1996) who found in their sample of 88 veterans with vision loss, persons with decreased acuity navigate more effectively than those with peripheral loss and limited contrast detection. Additionally, the influence of glare was found to affect route traversal time and efficiency.…”

Section: Functional Vision and Mobility Performancesupporting

confidence: 90%

The impact of functional vision changes on independent travel for individuals with adult-onset visual impairment

Avila

2018

International Journal of Orientation &Amp; Mobility

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This study explored experiences with functional vision changes resulting from adult-onset vision conditions. The impact of glare, lightto-dark adaptation, depth perception, night blindness, and contrast sensitivity are examined for the way participants perceive their effects on willingness to engage in independent travel. Two interviews were conducted with 13 participants. These consisted of structured and semi-structured, open-ended questions to determine the impact of functional vision changes on mobility and pedestrian travel. Qualitative, open and a priori coding was used to derive themes and categories for the most significant functional vision considerations among participants. This study revealed changes in functional vision impact participants' perceived safety and were of concern when considering independent travel. Orientation and mobility (O&M) services were denied to some participants who had surrendered driving privileges and were considered vision impaired, but not legally blind, even though issues with functional vision impacted safer travel. The impact of functional vision changes on individuals with adult-onset vision impairment was found to affect participant mobility. Agencies serving this population can provide clients with safer travel options when all functional vision changes are considered beyond acuity and field of vision loss.

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Section: Functional Vision and Mobility Performancesupporting

confidence: 90%

The impact of functional vision changes on independent travel for individuals with adult-onset visual impairment

Avila

2018

International Journal of Orientation &Amp; Mobility

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“…Black et al [12] and Leat and Lovie-Kitchin [7] verified that PFL can significantly slow walking speed, whereas AL impaired self-locomotion perception. Matsuda et al [13] and Kuyk, T. [30] derived the similar conclusion with both AL and PFL patients. For an on-site experiment that included simulated AL and simulated PFL participants, Tarampi [31] indicated spatial updating remains accurate during locomotion under conditions of significantly degraded AL and contrast, albeit with heightened variability compared to non-degraded viewing.…”

Section: Large Scale Spatial Task: Mobility Wayfinding and Navigationsupporting

confidence: 57%

A review study of space perception and navigation of people with low vision: is simulated low vision a reliable methodology?

Dong,

Karmann

2024

IOP Conf. Ser.: Earth Environ. Sci.

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The inclusion of visually impaired participants in research protocols concerning their perception of space and navigation is essential for the reliability of the results, given the strategies developed by the people concerned in everyday life. However, the diversity of visual impairments, the scarcity of participants and possible safety issues due to obstacles in the physical space induce limitations and prompt researchers to look into alternative methodologies. Simulated low vision is seen as an option. This method involves sighted participants wearing goggles with customized filters or watching processed images in virtual environments. The objective of this study is to investigate the reliability of simulated low vision as a research method to describe the space perception and navigation of people with visual impairment. We conducted a literature review and identified 36 quantitative studies on low vision spatial performance involving multiple user groups. Simulated low vision proved effective in small-scale spatial ability evaluation, such as object detection and distance estimation, but remained challenging regarding large-scale capacity, such as navigation with mobility requirement. Advances in virtual environments suggest that they are a good alternative to goggles and screen displays because of their precision in mimicking ocular problems in simulation settings. Finally, the use of head-mounted-display (HMD) by people with real low vision could open up the possibility of greater testing in safer and controlled conditions, but requires confirmation of the validity of the protocols.

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“…Comparisons to the literature are difficult since the mobility courses used to date have the disadvantages of requiring a great deal of time and require a large amount of space [10][11][12][13][14][15][16][17][18][19]. They are therefore not amenable for repeated testing.…”

Section: Discussionmentioning

confidence: 99%

“…However, in order to use the mobility performance as a measure of visual function, a mobility test, which is applicable for repeated testing, is needed so that patient's progress can be monitored. The mobility tests developed to date by other researchers are either not amenable to repeated testing because they are too long and require large amounts of space [10][11][12][13][14][15][16][17][18][19] or are designed to test subjects whose vision is substantially better than what is anticipated of subjects at the early phase of retinal implants where the assumed visual acuity will still be within the profound visual impairment range with a visual field (VF) of approximately 20 • .…”

Section: Introductionmentioning

confidence: 99%

Repeated mobility testing for later artificial visual function evaluation

et al. 2007

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The study investigates the utility of a newly designed mobility test for repeated testing of visual function in patients with severe visual impairment and future application in evaluating functional progress in patients with artificial vision. Ten subjects divided into three groups based on visual acuity (VA) ranging from light perception to 20/200 and reduced visual field (VF) were included in the study. The mobility test consisted of using a set of four different but structurally similar and relatively short mazes having a constant number of obstacles of various sizes. The subjects, divided into three groups by acuity, passed through each course several times. In general, the patients with better VA had a larger extent of VF. Average speed and number of contacts were recorded as measures of performance. The average passing times of the groups through the courses were significantly different (p = 0.03), which was influenced by VA and VF. There was no significant difference in average number of contacts between the groups (p = 0.15). The mobility test proved to be appropriate for gaining statistically relevant results in repeated individual testing of patients with severe vision impairment. Results show promise for use this mobility test as a tool for assessing visual function of patients undergoing implantation of a visual prosthesis for artificial vision.

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Visual Processing and Mobility Performance in Visually Impaired Adults

Cited by 6 publications

References 0 publications

The impact of functional vision changes on independent travel for individuals with adult-onset visual impairment

The impact of functional vision changes on independent travel for individuals with adult-onset visual impairment

A review study of space perception and navigation of people with low vision: is simulated low vision a reliable methodology?

Repeated mobility testing for later artificial visual function evaluation

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