Taking frequent breaks

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I used to read for hours at a stretch until I got nearsighted and became more conscious of my eyesight. I used to spend long hours on homework, on gaming, on surfing the net, on anything that involves close work, without taking a break. I have learned, though, that in order to prevent nearsightedness or strain, one should take frequent breaks from whatever he is doing. I find my habit hard to change, though. What about you? Do you make sure that you take frequent breaks, or do you continuous hours of work/play?