Wow, those are big lenses! Guess they function well for what they were made for: clear images all around.
I've read about some other VR headsets for smartphones that are attempting to improve their visual experience.... many with adjustable lenses. I don't think I'll ever get to try out all the VR headsets, but I'm especially excited about the Powis ViewR from http/powiscustom.com/products/powis-virtual-reality-kit. It has dual adjustable lenses, which is good since my eyesight varies in each eye. It's a great feature to have.