title: [Clinical analysis of measuring corneal thickness with non-contact method].
abstract: OBJECTIVE
  To compare accuracy of the Pentacam with A-ultrasonoscope in the measurement of central corneal thickness.
  
  
  METHODS
  According to the degree of myopia, 107 myopic patients (211 eyes) were divided into four groups. The central corneal thickness was measured with the Pentacam system and A-ultrasonoscope. The results were compared statistically and the differences between these two methods were analyzed.
  
  
  RESULTS
  Mean values of central corneal thickness measured by the Pentacam system and A-ultrasonoscope was (535.58 +/- 36.34) microm and (536.73 +/- 37.18) microm, respectively. There was no difference in the results obtained by these two methods in each myopia group (P > 0.05). The 95% limits of agreement were (-1.88, -0.42).
  
  
  CONCLUSIONS
  The data shows that the results obtained by Pentacam system do not have significant difference as compared with that from the A-ultrasonoscope. The Pentacam system can provide precise results and has the advantage of simplicity and non-contact. Therefore, it would be a promising instrument for the evaluation of central corneal thickness before the cornea refractive surgery.
authors.affiliation: Department of Ophthalmology, the Eye Ear Nose and Throat Hospital of Fudan University, Shanghai 200031, China.
authors.forename: Jia-qi
authors.initials: JQ
authors.lastname: Zhou
authors.forename: Ren-yuan
authors.initials: RY
authors.lastname: Chu
authors.forename: Xing-tao
authors.initials: XT
authors.lastname: Zhou
mesh_terms: D000293:Adolescent; D000328:Adult; D000867:Anterior Chamber / Q000000981:diagnostic imaging; D003315:Cornea / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008297:Male; D009216:Myopia / Q000473:pathology; D014463:Ultrasonography