title: Corneal hysteresis in normal subjects and in patients with primary open-angle glaucoma and pseudoexfoliation glaucoma.
abstract: OBJECTIVE
  To identify differences in corneal hysteresis (CH) between primary open-angle glaucoma (POAG), pseudoexfoliative glaucoma patients (PXSG) and a healthy control group.
  
  
  METHODS
  In this retrospective study, CH was measured with the Ocular Response Analyzer. 90 subjects were evaluated, 30 subjects in each group. One eye per subject was analyzed.
  
  
  RESULTS
  In normal eyes, POAG and PXSG, CH was 9.8±1.6, 9.0±1.9 and 8.0±1.5 mm Hg, respectively. CH was significantly lower in PXSG patients than in POAG (p=0.042) and normal patients (p=0.0001), but no significance was found between the POAG and the normal group (p=0.23).
  
  
  CONCLUSIONS
  CH differs in the different groups and might be considered in glaucoma evaluation. Further studies with larger sample sizes are needed.
authors.affiliation: Glaucoma Department, St. Eriks Eye Hospital, Karolinska Institutet, Stockholm, Sweden.
authors.forename: Marcelo
authors.initials: M
authors.lastname: Ayala
mesh_terms: D000368:Aged; D001696:Biomechanical Phenomena; D003315:Cornea / Q000503:physiopathology*; D004548:Elasticity / Q000502:physiology*; D054459:Elasticity Imaging Techniques; D017889:Exfoliation Syndrome / Q000503:physiopathology*; D005260:Female; D005902:Glaucoma, Open-Angle / Q000503:physiopathology*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014065:Tonometry, Ocular