<p>➀ The EPSILON project, coordinated by Fraunhofer HHI, employs VR technology and wearable sensors to objectively diagnose and differentiate Post-COVID symptoms like cognitive deficits and fatigue;</p><p>➁ Data from VR-based cognitive tests, physiological sensors, and digital psychological assessments are integrated into a web-based AI platform for real-time analysis and visualization, aiding personalized treatment;</p><p>➂ The developed tools aim to provide a scalable diagnostic framework, with future applications planned for rare diseases such as Rett syndrome.</p>