title: [Correlation between confocal tomography of the optic nerve (HRT) and the perimetric frequency doubling technology].
abstract: OBJECTIVE
  To correlate the five phases of optic nerve (ON) damage staging, as assessed by means of confocal tomography (HRT) with the five stages of visual field, assessed by conventional perimetry (standard automatic perimetry, SAP) and classified in five stages according to the "GLAUCOMA STAGING SYSTEM". The second step was to correlate the same optic nerve staging system with the results of the visual field tested with non-conventional perimetry using the frequency doubling technology (FDT) employing the Humphrey-Zeiss and Welch-Allyn perimeter. The five stages of FDT visual field data evolution were classified according to the new "FDT STAGING SYSTEM".
  
  
  METHODS
  58 visual fields of 58 consecutive selected patients with either ocular hypertension or glaucoma with an age-range between 15 and 65 years.
  
  
  METHODS
  Visual field examination was performed with conventional (Octopus G2 threshold test) and non-conventional perimetry (FDT N30 threshold test), and the ON was assessed with confocal tomography (Heidelberg Retina Tomograph).
  
  
  RESULTS
  In 40 % of the visual fields tested normal with conventional perimetry, non-conventional perimetry (FDT) detected glaucomatous visual field defects corresponding topographically with the optic nerve damage revealed by HRT.
  
  
  CONCLUSIONS
  New non-conventional perimetric techniques such as FDT enable the very early detection of visual field defects topographically correlated to optic nerve damage.
authors.affiliation: Honorar-Dozent des Lehrstuhles für Ophthalmologie, Medizinische Fakultät der Universität von Buenos Aires, Argentina. sampaolesi@interar.com.ar
authors.forename: Roberto
authors.initials: R
authors.lastname: Sampaolesi
authors.forename: Paolo
authors.initials: P
authors.lastname: Brusini
authors.forename: Juan R
authors.initials: JR
authors.lastname: Sampaolesi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D017889:Exfoliation Syndrome / Q000145:classification / Q000175:diagnosis* / Q000503:physiopathology; D005260:Female; D005425:Flicker Fusion / Q000502:physiology; D005902:Glaucoma, Open-Angle / Q000145:classification / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology; D008297:Male; D018613:Microscopy, Confocal; D008875:Middle Aged; D009798:Ocular Hypertension / Q000145:classification / Q000175:diagnosis* / Q000503:physiopathology; D009887:Ophthalmoscopy; D009898:Optic Disk / Q000473:pathology / Q000503:physiopathology; D011237:Predictive Value of Tests; D012684:Sensory Thresholds / Q000502:physiology; D013223:Statistics as Topic; D014054:Tomography; D058609:Visual Field Tests