I regularly spend 8 hours at work staring at and reading from an LCD screen and have no eyestrain issues when doing this.
As far as i am aware its exactly the same at staring at a piece of paper or a vase of flowers.
what causes strain is not exercising the eye muscles. you should if having fixed focus on any object for more than 1hr take a few seconds every so often to focus on something at a different distance.
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