title: Frequency doubling technology and high-pass resolution perimetry in glaucoma and ocular hypertension.
abstract: OBJECTIVE
  To study the correlation between frequency doubling technology perimetry (FDT) and high-pass resolution perimetry (HRP) in eyes with primary open-angle glaucoma, suspect glaucoma, ocular hypertension, and in normal eyes.
  
  
  METHODS
  Ninety-four patients (162 eyes) were studied. Visual fields were assessed by HRP, FDT screening C-20-5 and FDT threshold C-20 programs. In eyes with a discrepancy between the test results, a comprehensive clinical examination was performed, including optic disc photography and Heidelberg retinal tomography (HRT).
  
  
  RESULTS
  There was a strong correlation between HRP global deviation and the FDT mean deviation (for FDT threshold C-20 test), and between HRP score and FDT score (for FDT screening C-20-5 ). The correlation coefficients were r = -0.83 and r = 0.77, respectively. In all, 75 eyes (46.3%) had normal HRP and FDT screening results, while 67 eyes (41.4%) showed abnormal results in both tests. In 12 eyes (7.4%) HRP was within normal limits while FDT screening was abnormal. Seven of these eyes were judged to have glaucoma; three of them had converted from ocular hypertension to glaucoma. In eight eyes (4.9%) HRP was abnormal while FDT screening was normal. Three of these were judged to have glaucoma. Thus, the sensitivity and specificity of the FDT screening test for the detection of glaucoma were 91.7% and 87.8%, respectively.
  
  
  CONCLUSIONS
  There was a strong correlation between FDT threshold C-20, FDT screening C-20-5 and HRP test results. Frequency doubling technology perimetry C-20-5 represents a good screening test for the detection of optic nerve damage in open-angle glaucoma.
authors.affiliation: Institute of Clinical Neuroscience, Section of Ophthalmology, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden. lada_kalabukhova@hotmail.com
authors.forename: Lada
authors.initials: L
authors.lastname: Kalaboukhova
authors.forename: Bertil
authors.initials: B
authors.lastname: Lindblom
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005902:Glaucoma, Open-Angle / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000175:diagnosis; D009898:Optic Disk / Q000473:pathology; D009901:Optic Nerve Diseases / Q000175:diagnosis*; D013223:Statistics as Topic / Q000379:methods; D014054:Tomography; D014786:Vision Disorders / Q000175:diagnosis*; D058609:Visual Field Tests / Q000379:methods*; D014794:Visual Fields