|Eye diagram showing ciliary muscles|
The culprit in this case was an old diversion called Shining Force (1992). My daughter and her best friend discovered it when they were much younger and were playing it for nostalgia reasons. Thankfully, his eyes are fine. He feel terrible, though, that hers reacted badly to their little excursion down memory lane. Fortunately, Katherine the Great and her vision will be fine. She just needs to be a bit smarter about her technology use.