Table 1.

Visual performance (mean, median, nonparametric 95 % confidence intervals) and the relative improvement of all tested dentists under all test conditions

Condition	Mean	Median	95 % CI	Improvement of visual performance (NV = 100 %)
NV*	8.43	11.52	11.52–13.98	100 %
NVf*	15.20	18.04	16.79–21.01	180 %
G*	21.07	21.01	19.52–22.90	250 %
K*	31.94	34.34	29.76–34.34	379 %
M4×*	57.27	53.48	53.48–58.19	679 %
M6.4×*	81.01	81.59	75.13–87.41	961 %

Note the difference between NV and NVf due to the natural magnification by moving closer to the object

*p < 0.01, significant differences within the columns