Table 5.

Scores of each perception parameter.

Parameter	Size
	Small	Medium	Large
Q1	2.13 ± 2.8	0.75 ± 1.75	1.88 ± 2.64
Q2	2.25 ± 2.66	1.13 ± 1.73	1.75 ± 2.96
Q3	2.5 ± 2.33	1.75 ± 1.91	0.75 ± 0.89

Note: Q1 stands for “the difficulty in perceiving the characters,” Q2 for “the difficulty in perceiving the characters away from the center,” and Q3 for “the difficulty in distinguishing the different rows and columns.”