Table 1. Result of the survey.

	Item	Range	Mean	SD
1	Convenience of application	3-10	8.10	1.583
2	The convenience of using the glass	6-10	8.40	1.476
3	Text readability	3-10	7.27	1.455
4	Are Pictures understandable?	4-10	8.17	1.895
5	Understanding the skills	5-10	8.77	1.478