I believe vergence accomodation can still be a problem, even if the focus is fixed at 60cm (close to infinity). If an object is up close in the virtual world (s

I believe vergence accomodation can still be a problem, even if the focus is fixed at 60cm (close to infinity). If an object is up close in the virtual world (say 20cm), it's still stuck at a focus of 60cm. I believe Nvidia demoed a solution for this at SIGGRAPH ~4 years back. Liquid lenses were employed to change the lenses focal length based on the content and user gaze.