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.