Application of ultrasound biomicroscopy in the diagnose of slight lens dislocation

Abstract

Objective To evaluate the application of ultrasound biomicroscopy (UBM) in the diagnose of slight lens dislocation.Methods Seventy-three patients with ocular contusion and clinical suspicion of lens dislocation were performed UBM direct examination and UBM indirect examination by two technicians for detecting the rupture o'clock position of suspensory ligament of lens.The time required for examination was calculated.Results Among 73 cases with clinical suspicion of lens dislocation,49 cases could cooperate with UBM direct examination.The completion rate was 67.35％.All cases could cooperate with UBM indirect examination.The completion rate was 100％.The difference was statistical significance (P ＜0.01).Thirty-seven cases were final diagnosis of lens dislocation by UBM direct examination.Thirty-eight cases were prompted diagnosis of lens dislocation by UBM indirect examination.UBM indirect examination sensitivity was 97.29％,specificity 90.91％,false positive rate 16.67％,false negative rate 2.70％,the correct index 88.21％,positive predictive value 94.74％,negative predictive value 90.91％.The time required for UBM direct examination was 30.9min± 8.7min.The time required for UBM indirect examination was 9.2min± 1.1min.The difference was statistical significance (t =20.034,P ＜0.01).The rupture o'clock positions of suspensory ligament of lens detected by UBM direct examination were close to the position detected by UBM indirect examination.The difference was no statistical significance (t =0.495,P =0.624).Conclusions UBM direct and UBM indirect combined examination is a fast,effective way for the final diagnosis of slight lens dislocation. Key words: Lens dislocation; Ultrasound biomicroscopy; Diagnose