I don't see this as new/news. When my sister was about 12 (1990ish) and had a lazy eye, the doctor gave her an eye patch and told her to play an hour of video games every other day. I assume this wasn't just his thoughts on treatment and that there were studies at that time that pointed him toward this treatment.
To be fair, the study talks about improved recognition of shades of gray rather than curing a lazy eye, but I still don't think that playing video games to improve eye function is a new thing.