Eye pain when looking at close up objects?

So recently I have begun to to get eye pain (strain) when looking at objects close up, my vision isn't blurry but it puts strain on my eyes, I have been watching a lot of Netflix on my iphone 4 lately when going to bed (up to two hours), the pain comes and goes, sometimes it's only comes up at night sometimes in the morning. I did a bit of research and I have symptoms similar to farsightedness yet I took an inline test which told me I'm close sighted. I would really appreciate a thoughtful and more lengthy answer. FYI I'm 15, a guy, and do swimming 2 hours everyday.

You know, it's not like you are going to get another pair of eyes, right? Get yourself to an eye doctor! Don't fool around with your eyes. You might be fine. And you might not be. But don't wait around until there's a real problem. Get your eyes checked out. Even if you just go to an optometrist. Like to Lens Crafters or something like that. Make an appointment and have your eyes checked out and tell an eye professional about the pain. Good luck. I hope you are fine, but you really should take care of this.

There's a condition called iritis that can cause pain when you try and focus close. It is better to consults a good eye specialist.

Sometimes, when people are playing video games or watching movies (or anything they are staring at or concentrating on) they don't blink often enough and this can make your eyes dry & irritated, etc. Start with a regular eye exam, in addition to checking if you need glasses or not, they also check for various eye diseases too. If you have insurance, it often covers at least part of the cost. Headaches from reading or looking at close things often suggests farsightedness, but you really need a proper eye exam to know for sure. Looking at the phone in the dark, if that's what you're doing, won't make you need glasses but, is it kind of stressful to the eyes and could cause headaches if you are already borderline on being farsighted.