Gamers in particular are quite vulnerable to digital eye strain, but not only because of the extra hours in front of the screen. Because gamers are so concentrated, blinking rate decreases and their eyes rapidly move to capture movements on the screen. These two actions mean gamers are more susceptible to computer vision syndrome and eye fatigue.
You've probably heard the old adage that "too much computer games make your eyes go square" - well, while this isn't true, what your mother probably meant was that you'll do damage to your eyes if you stare at the screen too long. And in this sense, she was right.
The artificial blue light emitted by gaming screens has both short and long term effects. It's effects are also more prevalent at night time. Firstly, you'll notice a dry or itchy sensation in your eyes, followed by headaches and general discomfort. Studies have also shown that prolonged gaming can lead to disruption of regular sleeping patterns, which you've probably noticed. This is because blue light reduces your ability to produce melatonin, the sleep-inducing hormone.