title: Influence of Pterygium on Corneal Biomechanical Properties.
abstract: To evaluate the influence of pterygium on corneal biomechanical properties as measured by the ocular response analyzer (ORA).
  
  
  
  ORA measurements of 48 eyes with primary nasal pterygium were compared with those of healthy fellow eyes. The mean age of the patients was 46.6 ± 18.9 years. Corneal hysteresis (CH), corneal resistance factor (CRF), Goldmann-correlated intraocular pressure (IOPg), and corneal-compensated IOP (IOPcc) were obtained for each subject by using the ORA (Reichert Ophthalmic Instruments, Depew, NY).
  
  
  
  CH and CRF were significantly lower in the eyes with pterygium than in the healthy fellow eyes (p1 = 0.011, p2 = 0.014, respectively). On the other hand, there were no significant differences between the eyes with pterygium and healthy fellow eyes concerning IOPg and IOPcc (p1 = 0.948, p2 = 0.129, respectively).
  
  
  
  The present study showed that biomechanical properties measured by ORA were affected by pterygium. The eyes with primary nasal pterygium had lower CH and CRF than healthy fellow eyes. Therefore, the effect of pterygium should be taken into account in order to make correct diagnoses by ORA.
authors.affiliation: a Ophthalmology Department , Recep Tayyip Erdoğan University Medical School , Rize , Turkey.
authors.forename: Veysi
authors.initials: V
authors.lastname: Öner
authors.affiliation: b Malatya State Hospital , Malatya , Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Taş
authors.affiliation: b Malatya State Hospital , Malatya , Turkey.
authors.forename: Erdal
authors.initials: E
authors.lastname: Özkaya
authors.affiliation: c Ophthalmology Department , Recep Tayyip Erdoğan University Medical School Education and Research Hospital , Rize , Turkey.
authors.forename: Asker
authors.initials: A
authors.lastname: Bulut
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena; D002648:Child; D003315:Cornea / Q000000981:diagnostic imaging / Q000503:physiopathology*; D063171:Corneal Pachymetry; D005260:Female; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D011625:Pterygium / Q000175:diagnosis / Q000503:physiopathology*; D014065:Tonometry, Ocular; D055815:Young Adult
keywords: Corneal hysteresis; corneal resistance factor; ocular response analyzer; pterygium