title: Visually evoked potentials after panretinal photocoagulation in omani patients with uncontrolled diabetes mellitus.
abstract: OBJECTIVE
  To report on the changes of latency and amplitudes of the pattern VEP in patients with uncontrolled diabetes mellitus II and I before and after panretinal laser treatment.
  
  
  METHODS
  Single center hospital based comparative study.
  
  
  METHODS
  One hundred eyes of patients with proliferative diabetic vitreoretinopathy, and HbA1C ≥ 10 percent were subjected to Pattern Visually Evoked Potentials (Medtronic keyopint system, Nicolet) prior to and 4 weeks after PRP. Results were compared to age-matched non-diabetic controls. Chi-Square test, and paired 't' test were used for statistical analysis.
  
  
  RESULTS
  Preoperative mean VEP amplitude was 8.35mV±3.71, and not significantly different to the control group (mean 10.51mV±3.34) (chi square test p=1). Mean preoperative P100 latency was 106.93±7.90ms and significantly different to the control group (103.21±7.65ms) (paired t-test p=0.001). After laser treatment, VEP amplitudes decreased in 48/100 eyes (mean total 5.11mV±2.4), and P100 latency increased in 75/100 eyes (mean total 110.47±7.35ms).
  
  
  CONCLUSIONS
  In this study, PRP was followed by a significant decrease in VEP amplitudes in 48 percent and increase in latency in 75 percent of eyes.
authors.affiliation: Department of Ophthalmology, Sultan Qaboos University College of Medicine, Muscat, Al-Khod, Oman.
authors.forename: Radha
authors.initials: R
authors.lastname: Shenoy
authors.forename: Habiba
authors.initials: H
authors.lastname: Al-Belushi
authors.forename: Sadiqa
authors.initials: S
authors.lastname: Al-Ajmi
authors.forename: Susan Margaret
authors.initials: SM
authors.lastname: Al-Nabhani
authors.forename: Shyam Sunder
authors.initials: SS
authors.lastname: Ganguly
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Bialasiewicz