After reading the paragraph below, answer the questions that follow.
Myopia can be corrected with artificial lenses or surgery and is generally regarded as a benign disorder. However, as myopia is also associated with more severe conditions such as cataracts and glaucoma, a change in the prevalence of myopia (proportion of the population with myopia) may be a public health concern. The graph shows the change in the prevalence of myopia in three major ethnic groups in Singapore at three points in time.
Source: Adapted from Morgan, I.G., Ohno-Matsui, K., and Saw, S. M. (2012). Myopia.
Lancet, 379: 1739-1748.
Public health scientists conclude that the change in myopia prevalence is a result of environmental and not genetic factors. Does the graph support this conclusion?
◦ Yes. All ethnic groups have similar rapid increases in myopia prevalence over time.
◦ No. Only some ethnic groups increased in myopia prevalence over time.
◦ No. Some ethnic groups decreased in myopia prevalence over time.
◦ Yes. All ethnic groups have similar rapid decreases in myopia prevalence over time.
The chain of infection: preventative measures follow each link of the chain.
Myopia
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