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Having the top of the screen level with your eyes is H&S advice, but doesn't work for varifocal wearers. Positioning it thus means with an upright head you are looking at the screen through the mid-distance part of the lens; to read the screen, you therefore have to tilt you head back. I find having the screen/laptop lower is preferable, as I am then looking through the lowest reading part with a more upright head (caused a few discussions with the H&S people at work, until they understood my reasoning!). Learning to touch type would be a greater help...
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