The actor claims eye training helped cut his power by 50% after doctors once told him it couldn’t change. But can exercises really reverse myopia in adults? An eye specialist weighs in.

Nearsightedness, or myopia, is an eye problem that causes objects at a distance to appear blurry. A nearsighted person can see things close to them but have a hard time focusing on objects far away.

Researchers studying over 1,000 children found that omega-3 fatty acids may help protect against myopia, while saturated fats may increase risk. Kids with more omega-3 in their diet had healthier eye ...