The researchers compared children of Chinese ancestry living in Singapore and Sydney, and the comparison showed that children living in Singapore had 10 times higher myopia rates than those living in Sydney. But Morgan said children living in Sydney spent more time on near-eye activities, and they read twice as much per week as children living in Singapore. Their main difference, however, was that children in Sydney spent nearly four hours more time outside on weekends than children living in Singapore. Morgan believes that sun exposure prompts the body to produce more dopamine and therefore reduces myopia. Dopamine is known to limit eye growth, and myopia is caused by overgrowth of the eye (ciliary muscle contraction thickens the lens). Australian researchers have found that sun exposure is a key factor in preventing myopia in children. Dr. Ian Morgan of the Australian Centre for Vision Science Research said that myopia rates in East Asia have risen dramatically over the past 30 years. The sunlight is the best vitamin D “activator”, and some mothers occasionally want to take their children into the sun to help their babies’ bones grow healthily. In fact, the sun is a discipline, to choose the appropriate time and way. 1, do not give the baby wear too much some mothers with baby sunshine, afraid of baby cold, to the child wearing hats, gloves and masks, do not know that this sunshine is difficult to achieve the purpose. Give your baby a sunbath should expose the skin as much as possible according to the temperature conditions at the time. 2, pay attention to the irradiation part should avoid direct sunlight on the head, and do not sunbathe through the glass. Often through the glass to let the baby sunbathing, most of the ultraviolet rays blocked out, and therefore reduce the effectiveness of the sun. 3, it is best not to give your baby a bath before sunbathing because the bath can wash away the material “7-dehydrocholesterol” that synthesizes active vitamin D in human skin, reducing the role of promoting calcium absorption in the body. 4, timely rubbing moisturizer after sunbathing, it is best to apply some moisturizer to the baby’s skin and so on, to maintain the baby’s skin.