Eat highly coloured vegetables. Carrots really do help your vision!
Take regular breaks, and focus on something in the distance. I am very short-sighted, and if I use the computer for long periods of time my eyes get 'fuzzy' and sore. A walk usually clears it up.
Short-sightedness is a combination of factors, including genetics, diet, and habits. Myopia is on the rise in the USA and Europe, probably because we are increasingly doing jobs which require near-work, computers etc. and because we don't eat properly.
And speak to your optician.
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