title: Changes in corneal sensation following 20 and 23 G vitrectomy in diabetic and non-diabetic patients.
abstract: OBJECTIVE
  To evaluate the changes in corneal sensation (CS) following two different port sizes vitrectomy in diabetic and non-diabetic patients.
  
  
  METHODS
  Patients prepared for pars plana vitrectomy were randomly assigned to four groups: diabetics to either 20 G or 23 G and non-diabetics to either 20 G or 23 G vitrectomy systems. CS was measured using the Cochet-Bonnet aesthesiometer at baseline preoperatively, and at 1 day, 1 week, and 1 month postoperative.
  
  
  RESULTS
  A total of 40 eyes of 40 patients were included in this study; 20 patients (20 eyes) in each of the 20-G and 23-G groups. The mean age was 55.51±10 years and male/female ratio was 2:3. There were no significant difference between CS at baseline, and at 1 day, 1 week, and 1 month between both the 20-G and 23-G groups. There were significant drops in CSs at 1 day and 1 week for both groups (20 G and 23 G) with incomplete recovery for the 20-G group and complete recovery for the 23-G group. Comparing the two diabetic subgroups (20 G and 23 G) and two non-diabetic subgroups (20 G and 23 G), there were no significant differences in CS between subgroups. Diabetics' eyes had lower CSs throughout the study period in the 20-G and 23-G groups, which was significant at day1 and week 1 postoperatively.
  
  
  CONCLUSIONS
  The vitrectomy procedure showed reduction in CS in the postoperative period with minimal nonsignificant difference between 20 G and 23 G systems. However, diabetics' eyes showed compromised CS preoperatively and a further significant reduction for 1 month postoperatively compared with non-diabetics.
authors.affiliation: Department of Ophthalmology, Ain Shams University, Cairo, Egypt.
authors.forename: M M
authors.initials: MM
authors.lastname: Mahgoub
authors.affiliation: Department of Ophthalmology, Kasr El Aini Hospital, Cairo University, Cairo, Egypt.
authors.forename: T A
authors.initials: TA
authors.lastname: Macky
mesh_terms: D000328:Adult; D000368:Aged; D003315:Cornea / Q000503:physiopathology*; D003930:Diabetic Retinopathy / Q000503:physiopathology*; D058450:Endotamponade; D005260:Female; D006801:Humans; D008297:Male; D008866:Microsurgery / Q000379:methods; D008875:Middle Aged; D011184:Postoperative Period; D011446:Prospective Studies; D012163:Retinal Detachment / Q000503:physiopathology / Q000601:surgery*; D012678:Sensation Disorders / Q000503:physiopathology*; D014821:Vitrectomy / Q000379:methods*; D018630:Vitreoretinopathy, Proliferative / Q000503:physiopathology / Q000601:surgery*; D055815:Young Adult