Myopia is the leading cause of vision loss in the world today. This visual disorder can get worse over time. In addition to causing vision loss, myopia can change the structure of the eye, putting patients at risk for future eye disease.

Statistical studies show that the incidence of refractive errors is increasing rapidly in Vietnam. In particular, astigmatism can occur at any age, regardless of children or adults. Astigmatism is hereditary, so newborns can also have this refractive error.