My left eye hurts when I move it from side to side and up and down?

I was on my iPhone last night at 11:00 pm, and I was reading a small print book for class today. When I move my left eye left and right and side to side to look at something, they hurt. I have pretty bad eyesight, an wear thick-ish classes. Is this because I was straining them or?

Yes it could be, but small print always strains the eyes, still you should check with your eye doctor cause you may need a stronger/ or weaker prescription.

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