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I read a lot as a kid, up to hours a day, and now I'm nearsighted. I could have used some VR to let my eyes focus in the distance instead of always focusing at arm's length. I had my first glasses when I was 6, got worse over time. No doctor ever told me to read less. Watching TV was considered bad though, even though you sit much further away.

Too much 3D could make your eyes lazy as you train your eyes to always focus in the distance. The focal point doesn't chance for objects in front of you, which can cause discomfort if you're not used to it. Whether that has long lasting effects, no clue. Some doctors say 3D helps with stimulating a lazy eye to see 3D.

Too much of something is usually bad for you. To be on the safe side, just say not recommended for any time.