Comparison of tear VIP concentrations and dry eye indices between the two groups
Tear-film
DRY EYE
There was insignificant difference in tear VIP concentrations between the two groups at any point in time. Although the difference was insignificant, subjects in the LASEK group had more severe dry eye indices (Table 
Comparison of VIP concentrations and dry eye indices between LASEK and FS-LASIK groups at different time pointsPre-op: preoperation; Post-op 1-week: Post-operative 1-week; Post-op 1-month: Post-operative 1-month; VIP: Vasoactive intestinal peptide; TBUT: Tear-film breakup time; OSDI: ocular surface disease index ; s: second; *: 
Comparison of the aggravated degree of dry eye indices between LASEK and FS-LASIK groups post-surgeryVIP: Vasoactive intestinal peptide; TBUT: Tear-film breakup time; OSDI: ocular surface disease index; s: second; 1–3: Difference between preoperative and postoperative 1 week;1–4: Difference between preoperative and postoperative 1 month; *: 