title: Chalazion as a cause of decreased vision after LASIK.
abstract: OBJECTIVE
  To describe a post-LASIK patient with decreased vision and a chalazion of the upper eyelid.
  
  
  METHODS
  A 46-year-old man was referred with decreased vision of 1 month's duration. He underwent bilateral uncomplicated LASIK for myopic astigmatism 1.5 years and bilateral enhancements 1 year previously. He had 20/20 uncorrected vision in both eyes after those procedures. He developed a chalazion of his right central upper eyelid 1 month prior with simultaneous blurring of vision. On our examination, his uncorrected visual acuity was 20/60 in the right eye. Complete eye examination including refraction, computerized corneal topography, and pachymetry were done.
  
  
  RESULTS
  With a manifest refraction of +1.25 +0.50x80, the visual acuity in the right eye improved to 20/20. Computerized corneal topography revealed circular central corneal flattening in both eyes, much greater in the right eye than the left eye. The location of the chalazion with the right eye closed corresponded to the area of central corneal flattening. The central power from the corneal topography was 39.4 D OD and 40.8 D OS. He was diagnosed as having acquired hyperopia associated with chalazion-induced central corneal flattening of the right eye. Chalazion-induced hyperopic change on topography disappeared, and his uncorrected vision improved to 20/20 in the left eye as the chalazion resolved completely.
  
  
  CONCLUSIONS
  In post-LASIK patients with decreased vision and topography changes late after surgery, periocular masses should be considered in the differential diagnosis. Decreased corneal thickness and rigidity after LASIK might be a predisposing factor to external compression-induced curvature changes.
authors.affiliation: Cornea Service, Wills Eye Hospital and the Department of Ophthalmology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA.
authors.forename: C B
authors.initials: CB
authors.lastname: Cosar
authors.forename: C J
authors.initials: CJ
authors.lastname: Rapuano
authors.forename: E J
authors.initials: EJ
authors.lastname: Cohen
authors.forename: P R
authors.initials: PR
authors.lastname: Laibson
mesh_terms: D001251:Astigmatism / Q000601:surgery; D017043:Chalazion / Q000150:complications*; D019781:Corneal Topography; D006801:Humans; D006956:Hyperopia / Q000209:etiology*; D020731:Keratomileusis, Laser In Situ; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000601:surgery; D011183:Postoperative Complications; D014786:Vision Disorders / Q000209:etiology*; D014792:Visual Acuity