title: Evaluation of immersion 20 MHz B-scan ultrasonography in observing lens in the alkali burn eyes.
abstract: OBJECTIVE
  To evaluate the accuracy of 20 MHz immersion B-scan ultrasonography in observing lens and to investigate the value of this noninvasive preoperative diagnosis method in alkali burn eyes.
  
  
  METHODS
  It was a comparative study. Fifty-six cases (56 eyes) of alkali burn eyes were examined by ultrasound biomicroscopy (UBM) and immersion 20 MHz B-scan ultrasonography from June 2011 to April 2013, the images were analyzed, and the ultrasonographic diagnosis compared with the operation results.
  
  
  RESULTS
  In 56 alkali burn eyes examined by UBM, the lens were not detected in 16 eyes; the IOL could be detected in 2 eyes; the anterior lens capsule surface or/and the front lens could be detected in 18 eyes, and lens opacification in 3 eyes of them; suspected abnormal lens were detected in the other 20 eyes. In all the same eyes examined by immersion 20 MHz B-scan ultrasonography, the lens were not detected in 16 eyes; the IOL could be detected in 2 eyes; 24 abnormal lens (opacity, lens expansion, shrinkage) and 14 normal lens were found. Compared with the intraoperative findings, the diagnostic accordance rate of the immersion 20 MHz B-scan appearance of lens was 100% (56/56), which was significantly higher than examined by UBM 57.14% (32/56) (χ(2)=30.55, P=0.0000).
  
  
  CONCLUSIONS
  Immersion 20 MHz B-scan ultrasonography can observe the lens accurately in alkali burn eyes. It has important clinical value to combine with UBM in eyes of alkali burn.
authors.affiliation: Department of Ophthalmology, Chinese People's Liberation Army General Hospital, Beijing 100853,China.
authors.forename: Qing-Hua
authors.initials: QH
authors.lastname: Yang
authors.affiliation: Department of Ophthalmology, Chinese People's Liberation Army General Hospital, Beijing 100853,China.
authors.forename: Bing
authors.initials: B
authors.lastname: Chen
authors.affiliation: Department of Ophthalmology, Chinese People's Liberation Army General Hospital, Beijing 100853,China.
authors.forename: Li-Qiang
authors.initials: LQ
authors.lastname: Wang
authors.affiliation: Department of Ophthalmology, Chinese People's Liberation Army General Hospital, Beijing 100853,China.
authors.forename: Guang-Hua
authors.initials: GH
authors.lastname: Peng
authors.affiliation: Department of Ophthalmology, Chinese People's Liberation Army General Hospital, Beijing 100853,China.
authors.forename: Zhao-Hui
authors.initials: ZH
authors.lastname: Li
authors.affiliation: Department of Ophthalmology, Chinese People's Liberation Army General Hospital, Beijing 100853,China.
authors.forename: Yi-Fei
authors.initials: YF
authors.lastname: Huang
keywords: B-scan; alkali burn; immersion; ultrasonography; ultrasound biomicroscopy