title: Evaluation of posterior lens capsule by 20-MHz ultrasound probe in traumatic cataract.
abstract: OBJECTIVE
  To investigate the accuracy of echography with a 20-MHz probe for evaluation of posterior lens capsule in traumatic cataract before surgery.
  
  
  METHODS
  Prospective interventional case series.
  
  
  METHODS
  This study consisted of 43 eyes with traumatic cataract that were scheduled to undergo surgery. In all cases, cataract was dense enough to prevent visualization of the posterior lens capsule. Echography was performed using a 20-MHz probe to detect rupture of the posterior lens capsule. All patients subsequently underwent cataract extraction and intraoperative findings of the posterior lens capsule were compared with the preoperative echographic findings.
  
  
  RESULTS
  This study included 43 eyes of 43 patients (38 men and 5 women) with a mean age of 35.6 ± 15.3 years (range, 4-68 years). The trauma was either blunt (4 eyes) or sharp (39 eyes); there was closed globe injury in 2 eyes and open globe injury in 41 eyes. By 20-MHz echography, posterior border of the crsytalline lens was clearly visualized in all 43 eyes. By 20-MHz echographic imaging, rupture of the posterior lens capsule was identified in 17 eyes (39.5%). During cataract surgery, it was noted that 14 eyes (32.6%) had rupture of the posterior lens capsule. Sensitivity, specificity, positive predictive value, and negative predictive value were 93%, 86%, 76%, and 96%, respectively, for 20-MHz echography to detect rupture of the posterior lens capsule. Also, the positive likelihood ratio, negative likelihood ratio, and odds ratio were 6.7, 0.08, and 81, respectively.
  
  
  CONCLUSIONS
  Echography with 20-MHz probe is an accurate imaging modality for detection of posterior lens capsule rupture in traumatic cataract preoperatively. This technique helps ophthalmologists have an appropriate surgical plan before operating.
authors.affiliation: Farabi Eye Hospital, Eye Research Center, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Tabatabaei
authors.forename: Mohammad Yaser
authors.initials: MY
authors.lastname: Kiarudi
authors.forename: Fariba
authors.initials: F
authors.lastname: Ghassemi
authors.forename: Sasan
authors.initials: S
authors.lastname: Moghimi
authors.forename: Mohammadreza
authors.initials: M
authors.lastname: Mansouri
authors.forename: Ahmad
authors.initials: A
authors.lastname: Mirshahi
authors.forename: Ahmad
authors.initials: A
authors.lastname: Kheirkhah
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002386:Cataract / Q000000981:diagnostic imaging* / Q000209:etiology; D002387:Cataract Extraction; D002648:Child; D002675:Child, Preschool; D005131:Eye Injuries / Q000000981:diagnostic imaging* / Q000209:etiology; D005260:Female; D006801:Humans; D007908:Lens, Crystalline / Q000293:injuries*; D016013:Likelihood Functions; D008297:Male; D008875:Middle Aged; D057852:Posterior Capsule of the Lens / Q000000981:diagnostic imaging* / Q000293:injuries*; D011237:Predictive Value of Tests; D011446:Prospective Studies; D015203:Reproducibility of Results; D012421:Rupture; D012680:Sensitivity and Specificity; D014463:Ultrasonography; D014949:Wounds, Nonpenetrating / Q000000981:diagnostic imaging / Q000209:etiology