A leading medical association has translated its concern about gamers' eye health into an educational game. In June, the American Optometric Association released Blink Land, a free mobile game that offers tips for players about addressing eye strain via quizzes and other in-game challenges.
Read MoreFree-to-play games are games that can be played for free but include optional paid benefits or content. Many of today's most popular games use this model, and include for instance Fortnite: Battle Royale, mobile game hits Candy Crush Saga and Pokémon Go, e-sports title League of Legends, and collectible card game Hearthstone.
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