title: The association of office intraocular pressure fluctuation in ocular hypertension with frequency doubling technology perimetry abnormality.
abstract: OBJECTIVE
  To characterize intraocular pressure (IOP) and central corneal thickness (CCT) measurements of ocular hypertension (OHT) patients with and without frequency doubling technology (FDT) perimetry test abnormalities.
  
  
  METHODS
  In this prospective, observational, cross-sectional, comparative case series, one eye of 33 OHT patients was randomly chosen. All OHT patients had IOP > or = 23 mmHg in 2 out of 3 measurements on the test day, normal appearing discs and nerve fiber layer, and normal white on white standard automated perimetry (SAP). Several IOP calculations (outpatient IOP, highest office IOP, mean office IOP, office IOP fluctuation, and office IOP peak), CCT, SAP and FDT parameters were compared between OHT patients with repeatable FDT perimetry abnormality and normal FDT perimetry.
  
  
  RESULTS
  Eight (24%) of 33 OHT patients had an abnormal FDT perimetry test. The median office IOP fluctuation (5.0 vs 2.0, P = 0.007), office IOP peak (3.2 vs 1.0, P = 0.004), and FDT pattern standard deviation (PSD) (5.03 v 3.32, P = 0.000) were significantly higher in OHT patients with repeatable FDT perimetry test abnormalities compared to OHT patients with normal FDT perimetry test. Office IOP fluctuation and office IOP peak were significantly correlated with both number of significantly depressed FDT points and FDT PSD index. CCT measurements and SAP global indices did not differ significantly in OHT patients with and without FDT perimetry test abnormality.
  
  
  CONCLUSIONS
  Our results suggest that currently diagnosed OHT patients who have large office IOP fluctuations and office IOP peaks are more likely to have repeatable FDT perimetry test abnormalities. These results suggest that OHT patients with large IOP fluctuations and IOP peaks are more likely to have early glaucomatous damage, and this should be taken into account when assessing the risk of conversion to primary open angle glaucoma.
authors.affiliation: Department of Ophthalmology, Adnan Menderes University, Aydin, 09100, Turkey. vdayanir@adu.edu.tr
authors.forename: Volkan
authors.initials: V
authors.lastname: Dayanir
authors.forename: Sayime
authors.initials: S
authors.lastname: Aydin
authors.forename: Pinar
authors.initials: P
authors.lastname: Okyay
mesh_terms: D000328:Adult; D000368:Aged; D003315:Cornea / Q000000981:diagnostic imaging / Q000473:pathology; D003430:Cross-Sectional Studies; D005260:Female; D005902:Glaucoma, Open-Angle / Q000503:physiopathology; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000503:physiopathology*; D010824:Physicians' Offices; D011446:Prospective Studies; D012307:Risk Factors; D014463:Ultrasonography; D014786:Vision Disorders / Q000175:diagnosis; D058609:Visual Field Tests / Q000379:methods; D014794:Visual Fields