title: Severe hyperopic shift and irregular astigmatism after radial keratotomy.
abstract: OBJECTIVE
  To report a case of acute high hyperopia occurring after radial keratotomy and evaluate the extent of corneal wavefront aberration with a Hartmann-Shack aberrometer.
  
  
  METHODS
  A 45-year-old man had undergone bilateral radial keratotomy with four incisions for myopia 15 years earlier. The patient developed significant hyperopia and irregular corneal astigmatism in the left eye after the operation, reducing his best-corrected visual acuity.
  
  
  RESULTS
  The best-corrected visual acuity was 20/20 (with refraction of +0.25-1.50 diopters [D] x 169) in the right eye and 10/20 (with refraction of +9.5D-3.00D x 50) in the left eye. Topography showed marked flattening of the left cornea, and simulated retinal images of Landolt C circles were distorted in the left eye.
  
  
  CONCLUSIONS
  This is a rare case in which radial keratotomy induced severe hyperopic shift. Wavefront analysis with a Hartmann-Shack aberrometer revealed severe irregular astigmatism with small clear zones.
authors.affiliation: Department of Ophthalmology, University of Tokyo Graduate School of Medicine, Japan. mimurat-tky@umin.ac.jp
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Mimura
authors.forename: Shigeto
authors.initials: S
authors.lastname: Fujimura
authors.forename: Satoru
authors.initials: S
authors.lastname: Yamagami
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Usui
authors.forename: Norihiko
authors.initials: N
authors.lastname: Honda
authors.forename: Rika
authors.initials: R
authors.lastname: Shirakawa
authors.forename: Shima
authors.initials: S
authors.lastname: Fukuoka
authors.forename: Shiro
authors.initials: S
authors.lastname: Amano
mesh_terms: D001251:Astigmatism / Q000209:etiology* / Q000503:physiopathology; D003315:Cornea / Q000473:pathology; D019781:Corneal Topography / Q000295:instrumentation; D057108:Corneal Wavefront Aberration / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D006956:Hyperopia / Q000209:etiology* / Q000503:physiopathology; D007646:Keratotomy, Radial / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D012720:Severity of Illness Index; D014792:Visual Acuity