title: [The analysis of the axises of corneal astigmatism and total astigmatism in astigmatic patients].
abstract: OBJECTIVE
  The axial amount and the relationship between the axises of corneal astigmatism and total astigmatism were statistically analyzed in ametropic patients, for the purpose of selecting the refractive correction, the base curve of contact lens, the axis of astigmatic contact lens, and providing the reference of operational amount of ecimer laser keratoplasty.
  
  
  METHODS
  The refractive state and the corneal curvature of ametropic patients were measured and consecutvely repeated 3 times in the same eye at the same state with the same autorefractometer in 107 cases. The detected axises of total astigmatism and corneal astigmatism were statistically analyzed through the computerized recording.
  
  
  RESULTS
  The mean angle between the axis of corneal astigmatism and the axis of total astigmatism was 5.73 degrees +/- 3.97 degrees in myopic patients, 3.13 degrees +/- 2.49 degrees in mixture astigmatism patients and 6.35 degrees +/- 4.20 degrees in hyperopic patients.
  
  
  CONCLUSIONS
  The angle between the axis of corneal astigmatism and the axis of total astigmatism in the refractive state was mainly caused by the difference of the axises of surface astigmatism of lens and cornea.
authors.affiliation: Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou 510060, China.
authors.forename: Z
authors.initials: Z
authors.lastname: Dai
authors.forename: R
authors.initials: R
authors.lastname: Yu
authors.forename: X
authors.initials: X
authors.lastname: Gong
authors.forename: S
authors.initials: S
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001251:Astigmatism / Q000145:classification / Q000473:pathology* / Q000503:physiopathology; D002648:Child; D002675:Child, Preschool; D003315:Cornea / Q000473:pathology* / Q000503:physiopathology; D019781:Corneal Topography; D005123:Eye / Q000473:pathology*; D005260:Female; D006801:Humans; D007908:Lens, Crystalline / Q000473:pathology; D008297:Male; D008875:Middle Aged; D012029:Refraction, Ocular; D012815:Signal Processing, Computer-Assisted