Modern virtual and augmented reality device can help simulate sight loss

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Modern virtual and augmented reality device can help simulate sight loss




Published today, during World Glaucoma Week 2020, a new study demonstrates how commercially

available head mounted displays (HMD) can be used to simulate the day-to-day challenges faced by

people with glaucoma.


Glaucoma is an umbrella term for a group of degenerative eye diseases that affect the optic nerve

at the back of the eye. It is the leading cause of irreversible blindness worldwide, and is estimated

to represent 11% of cases of serious sight impairment in the UK.


The study, from the Crabb Lab, at City, University of London, suggests potential applications of the

technology could include helping policymakers better assess the impact of visual impairment on

patients, and helping architects to design more accessible buildings.


Twenty-two volunteers who did not have glaucoma took part in the study. Participants wore a HMD

while performing various tasks in either virtual or augmented reality.


In the virtual reality task, participants were placed in a simulation of a typical, 'cluttered' house.

Moving their eyes and head allowed them to look around it in order to find a mobile phone hidden

somewhere in the house.


In the augmented reality task, participants navigated a real-life, human-sized 'mouse maze', which

they viewed through cameras in the front of the HMD.


Sensors in the HMD tracked the position of the participant's eyes, allowing the software to generate

a blurred area of vision, known as a 'scotoma', that obstructed the same portion of their visual field,

wherever they looked.


The scotoma was created using medical data from a real glaucoma patient, and either restricted vision

in the upper part of the participant's visual field, or in the bottom part. In 'control' trials the scotoma

was absent.

Similar to real glaucoma patients, participants were slower to perform the tasks when the simulated

impairment was present, and made more head and eye movements too. They likewise found the tasks

particularly difficult when the vision loss obstructed the bottom part of their visual field. The results also

showed how some people were better able to cope than others with an identical impairment.


The software the authors created to simulate the visual impairment (OpenVisSim) has been shared online

for others to freely use and develop. It is compatible with most commercially available HMDs and smartphones,

and supports a range of visual effects, designed to simulate the different symptoms associated with a range

of eye diseases.


First author of the study, Dr. Peter Jones, Lecturer at the Crabb Lab, City, University of London, said:


"While it's impossible to recreate exactly what it's like to have glaucoma, our findings suggest that digital

simulators can at least allow people to experience some of the challenges that people with glaucoma face

every day. We are now working with architects to explore whether sight-loss simulators can be used design

more accessible buildings and transport systems."


The study is published in the online journal, npj Digital Medicine.

















Modern virtual and augmented reality device can help simulate sight loss