@martin has explained, in his heterophoria blog, how to do eye exercises using tranaglyphs.
He also says that a LedStrain user has created this webapp for the purpose:
https://gaze-it.vercel.app/exercise
Does anyone know which LedStrain user this was? Or whether the webapp is published open-source somewhere on the web? Because it has some problems which I'd like to help fix (for my own sake, and for you guys).
I can't just download the html&js as-is, since it's compressed and obfuscated (using webpack). I mean, I can, but it makes the work unnecessarily difficult. 😉