A Randomized Study of Smile Exercise for Dry Eye

"Launch the smile face recognition APP on smart phone, after user guidance and pretest, a smile exercise will display on the phone, while facing the front camera on the phone, participant will do an exercise emphasizing facial movements, as exaggerated as possible. The exercise last for 8 weeks and 4 times a day"

0.1% sodium hyaluronate, 4 times a day, the time is in the morning, lunchtime, afternoon and evening. the interval between two training time is 2 hours, 1 hour before and after can be added or subtracted by users, 8 weeks.