Feasibility Test of Virtual Reality Obstacle Detection for Low Vision Walking

Study Overview
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Brief Summary
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The investigators are developing a new test of pedestrian hazard detection in virtual reality (VR) head-mounted display (HMD) headset, which shows virtual oncoming pedestrians in 3D while subjects are walking in real-world environment, for evaluation of visual field expansion to improve mobility in people with visual field loss.

Official Title
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Monocular Visual Confusion for Field Expansion

Conditions
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Hemianopsia, Homonymous Hemianopia, Tunnel Vision, Visual Field Defect, Peripheral, Visual Field Constriction Bilateral, Visual Field Defect Homonymous Bilateral

Intervention / Treatment
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* Other: Field expansion view


Participation Criteria
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Eligibility Criteria
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• Inclusion/Exclusion Criteria Inclusion criteria - Common At least 14 years of age (no upper age limit) In sufficiently good health to be able to complete sessions lasting 2-3 hours Able to understand English Able to give voluntary, informed consent Able to independently move short distances Binocular vision parameters within normal limits (Stereopsis ≤ 100 arc sec on any stereo test) Inclusion criteria - subjects with visual field loss Visual field loss, either peripheral field loss (<30 degrees diameter) or hemianopic field loss (blind in half of visual field) Better than 20/100 visual acuity in the worse eye Inclusion criteria - subjects with normal vision No restrictions of the peripheral visual field: (> 60 degrees diameter) Better than 20/40 visual acuity in the worse eye

Ages Eligible for Study
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Minimum Age: 14 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Field expansion view<br>Various configurations of field expansion views will be additionally displayed on HMD | Other: Field expansion view<br>* Overlaid small window on HMD to show the part of the scene in the blind field into portions of the participants' remaining, seeing, field of vision<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Pedestrian detection rate | Proportion of simulated pedestrians detected (in HMD walking) | Through study completion, an average of four months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Head movement range | During the pedestrian detection task, lateral and vertical head movement range to check the head scanning range | Through study completion, an average of four months | 
| Walking speed | During the task, the physical walking speed of the subject | Through study completion, an average of four months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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walking, collision, field expansion, visual field loss