Determining the Clinical Utility of Using Virtual Reality Headsets to Assess Visual Function in Those With Glaucoma.

Study Overview
=================
Brief Summary
-----------------
To validate a new virtual reality (VR) based visual field test against the gold standard clinical perimetry test (Humphrey Visual field test 24-2).

Detailed Description
-----------------
Perimetry (or visual field testing) is a vision test used to evaluate a patient's peripheral vision. It involves a patient fixating on a central target and pressing a button when they see a spot of light in their peripheral vision. It is an important way of deciding whether Glaucoma is progressing or not. Next generation virtual reality (VR) technologies offer an exciting new way of conducting perimetry in either a clinical or home environment, allowing more affordable and more frequent monitoring of disease progression in glaucoma, and an easier and more comfortable experience for patients. The investigators propose to create a perimetry test using a commercially available head mounted display for VR, and to assess its accuracy in glaucoma patients in relation to standard automated perimetry.

Official Title
-----------------
Determining the Clinical Utility of Using Virtual Reality Headsets to Assess Visual Function in Those With Glaucoma.

Conditions
-----------------
Glaucoma

Intervention / Treatment
-----------------
* Device: Visual field testing using Oculus Rift and Humphrey Visual Field Perimeter
* Device: Visual Field Testing using HUmphrey 24-3 Perimeter


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: - Patients with a clinical diagnosis of glaucoma with repeatable defects on standard automated perimetry. Exclusion Criteria: Presence of other ocular disease which impacts vision such as age-related macular degeneration or diabetic retinopathy. Any physical limitation that would make the participant unable to place their head in the head-rest to perform Humphrey Perimetry (Eg some patients with arthritic or neck problems are unable to use the headrests of ophthalmic devices). Any cognitive impairment that would limit their ability to perform perimetry or a history of vertigo/dizziness.

Ages Eligible for Study
-----------------
Minimum Age: 18 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Arms and Interventions

| Intervention/Treatment |
| --- |
|Device: Visual field testing using Oculus Rift and Humphrey Visual Field Perimeter|Glaucoma patients at Queen's University, Belfast, will be invited to undergo both Visual field testing using the Oculus Rift and the gold-standard Humphrey 24-2 (Carl Zeiss Meditec, Dublin, CA) at two visits, and evaluating consistency for detecting visual field impairments.|
|Device: Visual Field Testing using HUmphrey 24-3 Perimeter|Glaucoma patients at Queen's University, Belfast, will be invited to undergo both Visual field testing using the Oculus Rift and the gold-standard Humphrey 24-2 (Carl Zeiss Meditec, Dublin, CA) at two visits, and evaluating consistency for detecting visual field impairments.|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| mean deviation (MD) | Mean deviation in decibels (dB), this is a standard summary measure generated by all perimetric tests and is considered to represent generalised loss of visual function. | All statisitcal analysis will take place once all data collection has ended, average 1 year.. | 
| Pattern Standard Deviation | Pattern standard deviation in decibels (dB), this is a standard summary measure generated by all perimetric tests and is considered to represent localised loss of visual function. | All statisitcal analysis will take place once all data collection has ended, average 1 year.. | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Repeatbility of both devices | Bland and Altman plots and intra-class correlation coefficients will be generated for both tests for visit 1 vs visit 2 data. | All statisitcal analysis will take place once all data collection has ended, average 1 year.. | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Perimetry, Virtual Reality, Visual field testing