title: Topographical Analysis of Non-Glaucomatous Myopic Optic Discs Using a Confocal Scanning Laser Ophthalmoscope (TopSS).
abstract: OBJECTIVE
  To show normative data of optic discs and the mechanism of glaucoma in people with myopia.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  This study investigated 89 Korean adults with myopia but without glaucoma.
  
  
  METHODS
  Patients were divided into three groups according to the refractive error: low, moderate, and high; and axial length: normal or below normal length, moderately long, and extremely long. Optic disc variables were obtained by confocal scanning laser ophthalmoscope and compared among groups.
  
  
  RESULTS
  The optic disc parameters have a correlation between the refractive error and the optic disc parameters such as average depth, volume below, and half-depth volume. Those parameters also decreased as the axial length increased. The thickness of the volume above decreased significantly as the axial length increased, but a similar relationship was not evident with the refractive error change. In addition, the optic disc parameters were analyzed with respect to the 12 clockwise directions.
  
  
  CONCLUSIONS
  Analyses of optic disc parameters provided by TopSS™ revealed the height of the disc decreased as the myopic refractive error and/or axial length increased. The RNFL bundle became compacted in the thinner disc of the myopic population. This could be an explanation for the fragility of the RNFL in the myopic population. The 12 radial section analyses revealed the shallow cupping at the temporal side in the high-myopic, very-long-axis group. The neuroretinal rim (NRR) height significantly decreased at the superior and inferior sides. These findings suggest that the RNFL bundle should be under high mechanical strain in these sectors.
authors.affiliation: a Department of Ophthalmology and Visual Science , Incheon St. Mary's Hospital, The Catholic University of Korea , Incheon , Korea and.
authors.forename: Seung Hoon
authors.initials: SH
authors.lastname: Oh
authors.affiliation: b Department of Ophthalmology and Visual Science , Yeoui-Do St. Mary's Hospital, The Catholic University of Korea , Seoul , Korea.
authors.forename: Sung Kun
authors.initials: SK
authors.lastname: Chung
authors.affiliation: a Department of Ophthalmology and Visual Science , Incheon St. Mary's Hospital, The Catholic University of Korea , Incheon , Korea and.
authors.forename: Na Young
authors.initials: NY
authors.lastname: Lee
mesh_terms: D000328:Adult; D058452:Axial Length, Eye / Q000473:pathology; D063171:Corneal Pachymetry; D003430:Cross-Sectional Studies; D005260:Female; D005901:Glaucoma / Q000175:diagnosis; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D018613:Microscopy, Confocal; D009216:Myopia / Q000175:diagnosis*; D009412:Nerve Fibers / Q000473:pathology; D019721:Ophthalmoscopes; D009898:Optic Disk / Q000473:pathology*; D009901:Optic Nerve Diseases / Q000175:diagnosis*; D012165:Retinal Ganglion Cells / Q000473:pathology; D014065:Tonometry, Ocular; D014794:Visual Fields / Q000502:physiology; D055815:Young Adult
keywords: Confocal scanning laser ophthalmoscope; HRT; TopSS; glaucoma; myopia