Table 4.

Comparison of changes in the difference in astigmatism between two intra-patient measurements at each visit in group R and group M, before and after dry eye treatment, in vector analysis of astigmatism

	Pre-treatment	Post-treatment	P*	P**
Group R	0.54 ± 0.37	0.28 ± 0.23	1.73 × 10−6	3.96 × 10−6
Group M	0.40 ± 0.26	0.38 ± 0.27	0.274

*Wilcoxon signed-rank test: comparison of the difference in the astigmatism between two intra-patient measurements in group R and group M before and after dry eye treatment

**Mann–Whitney U test: comparison of the degree of change in difference in the power of astigmatism between two intra-patient measurements before and after dry eye treatment between group R and group M