title: [Clinical study of higher order wavefront aberrations with a Tscherning aberrometer].
abstract: OBJECTIVE
  To study the higher order aberrations of emmetropic and ametropic eyes with wavefront aberrometer.
  
  
  METHODS
  Forty of cases 77 emmetropic and ametropic eyes were measured with an aberrometer based on Tscherning's principle with the pupils dilated. The Zernike coefficients and root mean square values of wavefront aberrations up to the 6th order were recorded and statistically analyzed.
  
  
  RESULTS
  The C06, C07, C08, C12, C13, C14, C24, C26, and C27 were significantly different from zero under 7 mm pupil size and the C06, C10, C12, C23, and C24 were significantly different from zero under 4 mm pupil size. There was no significant difference of higher order wavefront aberrations between emmetropic and ametropic eyes. Comparing the age of 40 years or less with the age over 40 years, there were significant differences in RMS3 between the two under 7 mm pupil size, and statistical differences in RMS6 and RMSh between the two under 4 mm pupil size.
  
  
  CONCLUSIONS
  There are certain higher order wavefront aberrations in the normal human eyes, especially with the pupils dilated. No differences are found in higher order aberrations between emmetropic and ametropic eyes. The higher order aberrations of the age over 40 years are more than those of the age of 40 years or younger.
authors.affiliation: Department of Ophthalmology, Peking University Third Hospital, Peking University Eye Center, Beijing 100083, China. chenyueguo@sina.com
authors.forename: Yue-guo
authors.initials: YG
authors.lastname: Chen
authors.forename: Yan-ying
authors.initials: YY
authors.lastname: Zhong
authors.forename: Ying-jie
authors.initials: YJ
authors.lastname: Xia
mesh_terms: D000328:Adult; D000368:Aged; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000175:diagnosis / Q000503:physiopathology*; D012160:Retina / Q000503:physiopathology*; D014792:Visual Acuity