Abstract Objective To determine the prevalence and development of astigmatism in 17-19 years of age young people and find out the relationship between the change in axis category and the amount of astigmatism with different amounts of myopia degree.Methods This was a cross-sectional study.Nine hundred and five 17-19 years of age young people were selected for the study using a random digital method to determine the refractive errors and axes of astigmatism.A chi-square test was used to analyze the data.Results Astigmatism degree in the -0.26-1.50 D with-the-role range accounts for the largest percentage.For males,with-the rule astigmatism was found in 71.7% who had high myopia,about 71.1% who had moderate myopia,and 69.2% who had low myopia.With-the-rule astigmatism was found in female group who had high myopia section about 74.6%,approximately 84.0% who had moderate myopia and low-degree myopia section approximately 92.0%.The most common amount of astigmatism was -0.25-1.00 D for all axes of myopia in both males and females in all myopic degrees.A higher proportion of males in the high myopia group had with-the-rule astigmatism (x2=4.619,P=0.032).A higher proportion of women had with-the-rule astigmatism in low-degree myopia group higher than that in the comparative male group (x2=8.705,P=0.003).A higher proportion of males in the low myopia group had ≤-2.00 diopters of astigmatism proportion than in the other two male groups (x2=6.635,4.256,P<0.05) and as the myopic degree is higher,the proportion of males with ≤-2.00 diopters decreased.The proportion of females in the high myopia group with ≤-2.00 diopters of astigmatism was lower than that in the moderate myopia group (x2=11.780,P=0.001).Conclusion Among youths 17-19 years of age,with-the-rule astigmatism accounted for the largest percentage.Males with low myopia had a higher proportion of ≤-2.00 diopters of astigmatism compared to males in the other two groups and,as myopic degree increased,the proportion of males with ≤-2.00 diopters decreased.But females show the contrary trend.
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