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. Author manuscript; available in PMC: 2016 Jan 20.
Published in final edited form as: Appl Ergon. 2011 Oct 1;43(3):625–631. doi: 10.1016/j.apergo.2011.09.006

Table 4.

Distribution of each visual symptom by intervention period.a

Intervention Period
Pre
 Post
1 2 3 4 5
Stinging 0.16 (0.37) 0.12 (0.33) 0.12 (0.33) 0.12 (0.32) 0.11 (0.32)
Itching 0.18 (0.39) 0.19 (0.39) 0.15 (0.36) 0.14 (0.35) 0.17 (0.37)
Feeling gritty 0.18 (0.38) 0.17 (0.37) 0.16 (0.37) 0.14 (0.35) 0.16 (0.37)
Aching 0.27 (0.45) 0.22 (0.42) 0.17 (0.37) 0.20 (0.40) 0.17 (0.37)
Feeling sensitive to light 0.32 (0.47) 0.25 (0.44) 0.21 (0.41) 0.22 (0.42) 0.21 (0.40)
Becoming red 0.14 (0.35) 0.11 (0.32) 0.09 (0.28) 0.11 (0.31) 0.07 (0.26)
Tearing 0.08 (0.28) 0.07 (0.26) 0.06 (0.24) 0.05 (0.23) 0.06 (0.24)
Feeling dry 0.35 (0.48) 0.33 (0.47) 0.26 (0.44) 0.26 (0.44) 0.25 (0.43)
Burning 0.21 (0.41) 0.19 (0.39) 0.15 (0.35) 0.15 (0.36) 0.13 (0.34)
Blurry vision 0.16 (0.37) 0.14 (0.34) 0.15 (0.36) 0.14 (0.35) 0.14 (0.35)
Difficulty focusing 0.21 (0.41) 0.17 (0.37) 0.16 (0.36) 0.15 (0.36) 0.14 (0.35)
a

Mean (standard deviation).