My eyesight
Well, actually it was a combination of things. So, when I was a kid, there was this partial solar eclipse. Even though I had been warned not to watch the Sun during the eclipse, I did. I mean it looked like a big yellow ball to me, and I watched it for less than a minute. I came back to my room after that and next morning when I woke up everything became hazy. But, it was not that bad, I could still read things by squinting. So, I didn't tell anyone. I also continued playing games until the point where I had to acknowledge that I couldn't see well. So, the eclipse created the problem and the video games exacerbated it.