Myopia Can Be Corrected with Artificial Lenses or Surgery and Is

Multiple Choice

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?

A) Yes. All ethnic groups have similar rapid increases in myopia prevalence over time.
B) Yes. All ethnic groups have similar rapid decreases in myopia prevalence over time.
C) No. Only some ethnic groups increased in myopia prevalence over time.
D) No. Some ethnic groups decreased in myopia prevalence over time.