title: Topographic changes after excision surgery of primary pterygia and the effect of pterygium size on topograpic restoration.
abstract: OBJECTIVE
  To assess the effect of pterygium size on time-course change of corneal topography after excision surgery of primary pterygium.
  
  
  METHODS
  Retrospective case series included eyes that underwent excisions of primary pterygium. Pterygium size was graded according to the advancing edge position: less than one third of corneal diameter (grade 1), outside the pupil (grade 2), and within the pupillary area (grade 3). Time-course changes in corneal refractive power, astigmatism, and irregularity (surface regularity and asymmetry indices) in corneal topographies over 12 months postoperatively were compared between the pterygium size grades.
  
  
  RESULTS
  Pterygium excision was performed on 562 eyes, consisting of 119, 338, and 105 eyes with grades 1 to 3, respectively. Grade 1 did not change in corneal irregularity, and there was no difference between grades 1 and 2, except for corneal astigmatism at 6 months. Grade 3 showed significantly higher corneal refractive power and irregularity than grade 1 until 3 and 6 months, respectively, whereas corneal astigmatism was higher over 12 months.
  
  
  CONCLUSIONS
  Topographic changes after primary pterygium excision were associated with pterygium size. Pterygium advancing over the pupillary area required 6 to 12 months for corneal topography restoration, resulting in slow recovery of visual acuity.
authors.affiliation: Miyata Eye Hospital, Miyazaki, Japan.
authors.forename: Ryohei
authors.initials: R
authors.lastname: Nejima
authors.forename: Ayami
authors.initials: A
authors.lastname: Masuda
authors.forename: Keiichiro
authors.initials: K
authors.lastname: Minami
authors.forename: Yosai
authors.initials: Y
authors.lastname: Mori
authors.forename: Yumi
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: Kazunori
authors.initials: K
authors.lastname: Miyata
mesh_terms: D000368:Aged; D000704:Analysis of Variance; D001251:Astigmatism / Q000503:physiopathology / Q000601:surgery*; D019781:Corneal Topography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011625:Pterygium / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery*; D012029:Refraction, Ocular / Q000502:physiology; D012030:Refractive Errors / Q000503:physiopathology; D012189:Retrospective Studies; D014792:Visual Acuity / Q000502:physiology