Visual Fatigue Assessment in Virtual Reality via Ocular Biomechanics Modelling

With the rapid development of VR technologies and the growth of VR applications that touch different aspects of our lives, it became essential to assess visual fatigue during a VR experience.

With the subjective nature of fatigue and the large set of varying symptoms, it was difficult to subjectively quantify visual fatigue or estimate its onset. Our ocular biomechanical model can provide a solution to this. The model is highly customisable to accommodate all individual differences. It can be used for assessment of visual tasks in VR.

Biomechanical analysis has been extensively used in ergonomic assessment of human movement. We have extended the capabilities of biomechanical analysis into eye movement by creating an ocular biomechanical model. Our eye model includes all physiological and kinematic characteristics that uniquely identify human eyes. It is also easily modified to accommodate individual differences or even muscular disorders in eye muscles. The computer model has been validated by collecting eye-gaze tracking data from real subjects.

The ocular model has been integrated into biomechanical full-body models. This enables us to analyse the relationship between posture change and eye movement, filling in the need for simulation of eye-head coordination and eye-hand coordination simulations.

Various ocular disorders in eye muscles like superior oblique palsy and third nerve palsy can be simulated. Thus, the model provides a simulation tool that can be used to test surgical procedures or understand the effect of certain tasks on patients which will help design better virtual and natural environments for everyone.