A diet rich in omega-3 fatty acids is not only good for adults, but also crucial to ward off the development of shortsightedness (myopia) in children, according to a global study.

Omega-3 polyunsaturated fatty acids (ω-3 PUFAs), which can only be obtained from the diet -- found predominantly in fish oils -- are thought to improve or prevent several chronic eye conditions, including dry eye disease and age-related macular degeneration.

But whether they can help ward off myopia wasn't clear, as studies to date have been experimental and haven't included people.