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I'm 31 and I had perfect vision just 3 or so years ago. I got my first smart phone 6 years ago and I too wonder if I would have better vision today if I had used it less. And right now I'm wondering if I should create a regiment of "looking outside" for an hour every day at work. Maybe that would help at least stop things from getting worse.

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Be careful - the study clearly states that what's important to keep a good vision is exposure to (supposedly natural?) bright light. There's no real link between too much screen-time and a decline of it as the article states.

I gather that screen time is a contributing factor only because when you are staring at a screen you probably are not doing it outside in bright sunlight.

I definitely notice my vision getting worse when I use my phone for a while. Especially long or mid distance view suffers. It takes a few minutes to hours to get back to normal. Laptop screens have much less of this effect.

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