title: Scanning laser polarimetry in eyes with exfoliation syndrome.
abstract: OBJECTIVE
  To compare retinal nerve fiber layer thickness (RNFLT) of normotensive eyes with exfoliation syndrome (XFS) and healthy eyes.
  
  
  METHODS
  Sixty-four consecutive individuals with XFS and normal office-time intraocular pressure (IOP) and 72 consecutive healthy controls were prospectively enrolled for a cross-sectional analysis in this hospital-based observational study. The GDx-VCC parameters (temporal-superior-nasal-inferior-temporal [TSNIT] average, superior average, inferior average, TSNIT standard deviation (SD), and nerve fiber indicator [NFI]) were compared between groups. Correlation between various clinical parameters and RNFLT parameters was investigated with Spearman coefficient.
  
  
  RESULTS
  The NFI, although within normal limits for both groups, was significantly greater in the XFS group compared to controls: the respective median and interquartile range (IQR) values were 25.1 (22.0-29.0) vs 15.0 (12.0-20.0), p<0.001. In the XFS group, all RNFLT values were significantly lower compared to controls (p<0.001). However, they were all within the normal clinical ranges for both groups: TSNIT average median (IQR): 52.8 (49.7-55.7) vs 56.0 (53.0-59.3) µm; superior average mean (SD): 62.3 (6.7) vs 68.8 (8.2) µm; inferior average mean (SD): 58.0 (7.2) vs 64.8 (7.7) µm, respectively. TSNIT SD was significantly lower in the XFS group, median (IQR): 18.1 (15.4-20.4) vs 21.0 (18.4-23.8), p<0.001. There was no systematic relationship between RNFLT and visual acuity, cup-to-disc ratio, IOP, central corneal thickness, Humphrey mean deviation, and pattern standard deviation in either group.
  
  
  CONCLUSIONS
  Compared to control eyes, polarimetry-determined RNFLT was lower in XFS eyes with normal IOP. Therefore, close monitoring of RNFLT may facilitate early identification of those XFS eyes that convert to exfoliative glaucoma.
authors.affiliation: 1st University Department of Ophthalmology, Thessaloniki, Greece.
authors.forename: Antonios T
authors.initials: AT
authors.lastname: Dimopoulos
authors.forename: Andreas
authors.initials: A
authors.lastname: Katsanos
authors.forename: Dimitrios G
authors.initials: DG
authors.lastname: Mikropoulos
authors.forename: Theodoros
authors.initials: T
authors.lastname: Giannopoulos
authors.forename: Theodoros
authors.initials: T
authors.lastname: Empeslidis
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Teus
authors.forename: Gábor
authors.initials: G
authors.lastname: Holló
authors.forename: Anastasios G P
authors.initials: AG
authors.lastname: Konstas
mesh_terms: D000368:Aged; D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D017889:Exfoliation Syndrome / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009412:Nerve Fibers / Q000473:pathology*; D011446:Prospective Studies; D012164:Retinal Diseases / Q000473:pathology*; D057109:Scanning Laser Polarimetry