Visual Field Size Criteria for Mobility Rehabilitation Referral

Lovie‐Kitchin, Jan E.; Soong, Grace P.; Hassan, Shirin E.; Woods, Russell L.

doi:10.1097/opx.0b013e3181ff99be

Cited by 47 publications

(51 citation statements)

References 64 publications

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“…Successful navigation is often accomplished by individuals with low vision in the absence of external aids (Ludt & Goodrich, 2002). The primary focus of existing low vision navigation research is obstacle avoidance while walking, which is an important component to mobility (Kuyk, Elliott, Biehl, & Fuhr, 1996; Long, Rieser, & Hill, 1990; Lovie-Kitchin, Soong, Hassan, & Woods, 2010; Marron & Bailey, 1982; Pelli, 1987; Turano, Broman, Bandeen-Roche, Munoz, Rubin, West, & SEE project team, 2004). This research however has not directly addressed the ability to recover absolute distance and the general scale of the space.…”

mentioning

confidence: 99%

The Influence of Ground Contact and Visible Horizon on Perception of Distance and Size under Severely Degraded Vision

Rand¹,

Tarampi²,

Creem-Regehr³

et al. 2012

Seeing and Perceiving

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For low vision navigation, misperceiving the locations of hazards can have serious consequences. Potential sources of such misperceptions are hazards that are not visually associated with the ground plane, thus, depriving the viewer of important perspective cues for egocentric distance. In Experiment 1, we assessed absolute distance and size judgments to targets on stands under degraded vision conditions. Normally sighted observers wore blur goggles that severely reduced acuity and contrast, and viewed targets placed on either detectable or undetectable stands. Participants in the detectable stand condition demonstrated accurate distance judgments, whereas participants in the undetectable stand condition overestimated target distances. Similarly, the perceived size of targets in the undetectable stand condition was judged to be significantly larger than in the detectable stand condition, suggesting a perceptual coupling of size and distance in conditions of degraded vision. In Experiment 2, we investigated size and implied distance perception of targets elevated above a visible horizon for individuals in an induced state of degraded vision. When participants’ size judgments are inserted into the size–distance invariance hypothesis (SDIH) formula, distance to above-horizon objects increased compared to those below the horizon. Together, our results emphasize the importance of salient visible ground-contact information for accurate distance perception. The absence of this ground-contact information could be the source of perceptual errors leading to potential hazards for low vision individuals with severely degraded acuity and contrast sensitivity.

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mentioning

confidence: 99%

The Influence of Ground Contact and Visible Horizon on Perception of Distance and Size under Severely Degraded Vision

Rand¹,

Tarampi²,

Creem-Regehr³

et al. 2012

Seeing and Perceiving

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“…Unfortunately, the original study protocol failed to include measures of CS and Goldmann VF at baseline, which are stronger predictors of mobility in RP than VA 7,9,10,11 , and therefore, we can only assess mobility changes in relation to central vision changes. Comparing pre, 3 and 6 month VA, subjects 1, 2, 4 and 5 show substantial loss of VA in the treated eye and a corresponding decrease of mobility, with subject 4’s VA showing a reduction then recovery from 3 to 6 months post implant.…”

Section: Discussionmentioning

confidence: 99%

Orientation and Mobility Assessment in Retinal Prosthetic Clinical Trials

Geruschat¹,

Bittner

Dagnelie³

2012

Optometry and Vision Science

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“…Augmented vision field expansion device Visual field (VF) is an important aspect of visual function. When the field size is restricted below a certain level, it is strongly associated with a reduction in the ability to perform activities of daily living [2]. Patients with severely restricted peripheral field (known as tunnel vision), frequently have collisions, stumbles, and failures to find objects.…”

Section: Development and Evaluation Of Vision Assistive Devicesmentioning

confidence: 99%

Development and evaluation of vision rehabilitation devices

Luo

Peli

2011

2011 Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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We have developed a range of vision rehabilitation devices and techniques for people with impaired vision due to either central vision loss or severely restricted peripheral visual field. We have conducted evaluation studies with patients to test the utilities of these techniques in an effort to document their advantages as well as their limitations. Here we describe our work on a visual field expander based on a head mounted display (HMD) for tunnel vision, a vision enhancement device for central vision loss, and a frequency domain JPEG/MPEG based image enhancement technique. All the evaluation studies included visual search paradigms that are suitable for conducting indoor controllable experiments.

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Visual Field Size Criteria for Mobility Rehabilitation Referral

Cited by 47 publications

References 64 publications

The Influence of Ground Contact and Visible Horizon on Perception of Distance and Size under Severely Degraded Vision

The Influence of Ground Contact and Visible Horizon on Perception of Distance and Size under Severely Degraded Vision

Orientation and Mobility Assessment in Retinal Prosthetic Clinical Trials

Development and evaluation of vision rehabilitation devices

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