[Unity, C#, VR] The goal of my thesis was to present possible use cases for gaze direction to adjust the context of the scene in a virtual reality game used for eye therapy. Two solutions of this kind were described.

The first idea relies on changing the transparency of scene elements for the weak eye depending on in-game progress. The second technique makes use of eyetracking to help people with strabismus to correct their eye vergence. It allows to rotate the view for one eye and to slowly guide it to correct position.

In order to demonstrate these solutions a fireman game prototype was implemented using Unity game engine. Specifically for testing purposes a simple eye movement simulator was wrought. The goal of the thesis was accomplished through the conducted assessment of discussed methods.

Repository

Repository for this project is available here.

Simple Eye Simulation Demo

User can change the rotation of both or single eyeballs with a joystick.

Transparency Demo

First film shows how the transparency of fire is changed. Basically, if user looks at it but can’t extinguish it, the visibility for the strong eye is increased. Otherwise it is decreased to challenge the weak eye. Effect was achieved with a shader created in Shader Graph.

Camera Rotation Demo

Second film shows how the camera can follow the eye that deviates from correct eye vergence. After initial rotation, camera tries to slowly direct the eye towards desired position. White rays show where eyes are looking. Seperate camera rotation was achieved by editing the view matrix (Camera.SetStereoViewMatrix()).