title: Corneal biomechanical comparison of pseudoexfoliation syndrome, pseudoexfoliative glaucoma and healthy subjects.
abstract: OBJECTIVE
  To evaluate the differences in corneal biomechanical properties between healthy subjects and patients with pseudoexfoliation syndrome (PEX) and pseudoexfoliative glaucoma (PEXG) using the ocular response analyzer (ORA).
  
  
  METHODS
  One hundred eighteen eyes of 45 healthy, 43 PEX and 30 PEXG eyes were included in to the study. Corneal biomechanical parameters measurements were obtained using ORA. The main parameters assessed were corneal hysteresis (CH), corneal resistance factor (CRF), Goldmann-correlated pressure measurement (IOPg) and corneal compensated intraocular pressure (IOPcc). Ultrasound pachymetry was used for measurement of central corneal thickness (CCT).
  
  
  RESULTS
  In healthy subjects, PEX and PEXG eyes' mean CH values were 10.3 ± 1.4, 8.2 ± 1.4 and 6.8 ± 1.7 mmHg, respectively. The difference in mean CH between the PEXG and other two groups were statistically significant (p < 0.001). Mean CRF values were 10.3 ± 0.7, 7.9 ± 1.6 and 7.9 ± 1.9 mmHg, in healthy subjects PEX and PEXG, respectively. The difference in mean CRF between the PEX and PEXG was not statistically significant (p = 0.630), however the mean CRF was significantly higher in healthy subjects, compared to other two groups. Mean CCT were 546.3 ± 28, 525.5 ± 35 and 509 ± 36 μ, in healthy subjects, PEX and PEXG, respectively. The differences on CCT were also significant among the three groups (p < 0.001).
  
  
  CONCLUSIONS
  In this study, the corneal biomechanical features of subjects with PEX were found to be changed as compared to healthy controls. In these patients; CH, CRF and CCT were decreased which was more obvious in patients with PEXG in comparison to PEX patients.
authors: Ophthalmology Department, Zonguldak Karaelmas University , Zonguldak , Turkey .
authors: Serpil
authors: S
authors: Yazgan
authors: Ugur
authors: U
authors: Celik
authors: Neşe
authors: N
authors: Alagöz
authors: Mehmet
authors: M
authors: Taş
mesh_terms: D000368:Aged; D001696:Biomechanical Phenomena; D003315:Cornea / Q000000981:diagnostic imaging / Q000503:physiopathology*; D063171:Corneal Pachymetry; D003430:Cross-Sectional Studies; D017889:Exfoliation Syndrome / Q000453:epidemiology / Q000503:physiopathology*; D005260:Female; D005500:Follow-Up Studies; D005902:Glaucoma, Open-Angle / Q000453:epidemiology / Q000503:physiopathology*; D064368:Healthy Volunteers; D006801:Humans; D015994:Incidence; D007429:Intraocular Pressure; D008297:Male; D012189:Retrospective Studies; D014421:Turkey / Q000453:epidemiology; D014463:Ultrasonography
keywords: Corneal biomechanics; glaucoma; ocular response analyzer; pseudoexfoliation syndrome; pseudoexfoliative glaucoma