METHODS: Randomized single blind case control study was used. Patients with type 2 diabetes who were admitted to the department of ophthalmology, Xi'an No.4 Hospital for PDR and underwent 20G PPV surgery by the same surgeon were randomly divided into PDR control group(Group A)and sodium hyaluronate treatment group(Group B). Group B received continuous 1g/L sodium hyaluronate eye drops from 1d to 2mo after surgery. Before and 1wk, 1, 3mo after surgery, OSDI, SⅠt, BUT, fluorescein cornea staining(FL)and the tear film and corneal epithelial cell layer under corneal laser scanning confocal microscopy of the two groups were compared.

RESULTS:A total of 90 cases and 90 eyes were studied. In preoperative time, the two groups showed obvious dry eye syndrome, and compared with the control subjects, there were no significant difference existed between the two groups(P>0.05). In group A, ocular surface injury was further aggravated after surgery and failed to recover with time extension during the observation period.Some indexes of Group B improved at different observation time after surgery compared with those before surgery, and there were significant differences between group A and Group B after surgery(P<0.05).

CONCLUSION: Applying 1g/L sodium hyaluronate eye drops could relief the uncomfortable feeling of ocular surface in patients with PDR after 20G vitrectomy and accelerate the recovery of ocular surface disorders.