Table 4.

Unpaired rank sum, 2-sided Mann-Whitney U (Cronbach alpha=.05) for ratings of the images of the 3 groups taken with Google Glass.

Assessed parameters	Group A versus B		Group B versus C		Group C versus A
	z score	P value	z score	P value	z score	P value
Region of interest	−14.577	<.001	−22.603	<.001	−34.101	<.001
Sharpness	−11.396	<.001	−18.256	<.001	−26.095	<.001
Overall color settings	−12.740	<.001	−12.515	<.001	−25.412	<.001
Brightness	−2.737	.006	−5.052	<.001	−8.005	<.001