title: Humphrey visual field and frequency doubling perimetry in the diagnosis of early glaucoma.
abstract: OBJECTIVE
  To compare Humphrey Visual Field Analyzer (HVF) and Frequency Doubling Perimetry (FDP) testing in the diagnosis of early glaucoma.
  
  
  METHODS
  We performed HVF (24-2 standard full threshold) and FDP (N-30) evaluations in 34 consecutive patients with early primary glaucoma and 96 normal subjects. Early glaucoma was defined on the basis of disc changes of glaucoma; the mean deviation on white-on-white perimetry had to be no worse than 6 decibels. Glaucomatous optic neuropathy was defined as a combination of cup-disc asymmetry of more than 0.2, notching, excavation, thinning or pallor of superior or inferior neuroretinal rims, retinal nerve fibre layer defects of the wedge or diffuse type and neuroretinal rim haemorrhage. Both the glaucoma patients and normal subjects had vision better than 6/9 with correction. They had no media opacities other than early nuclear sclerosis and no fundus pathology. Further, normal subjects were free of systemic diseases known to affect the retina or optic nerve. The sensitivity and specificity of HVF and FDP were calculated.
  
  
  RESULTS
  There were 44 eligible eyes among the 34 subjects. The glaucomatous disc findings included notch (n=8), pallor (n=21), thinning (n=23) and haemorrhage (n=1) of the neuroretinal rim. The sensitivity and the specificity of the HVF were 52.3% and 57.3% respectively. The sensitivity and the specificity of FDP were 65.9% and 61.5% respectively.
  
  
  CONCLUSIONS
  The difference between FDP and HVF in the diagnosis of early glaucoma is not marked.
authors.affiliation: VST Center for Glaucoma Care, L V Prasad Eye Institute, Hyderabad, India. gcs@lvpeye.stph.net
authors.forename: G
authors.initials: G
authors.lastname: Chandrasekhar
authors.forename: Vallam
authors.initials: V
authors.lastname: Kunjam
authors.forename: Vallam S
authors.initials: VS
authors.lastname: Rao
authors.forename: Rishita
authors.initials: R
authors.lastname: Nutheti
mesh_terms: D000328:Adult; D005260:Female; D005901:Glaucoma / Q000175:diagnosis*; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D009898:Optic Disk / Q000473:pathology*; D009901:Optic Nerve Diseases / Q000175:diagnosis*; D012680:Sensitivity and Specificity; D014065:Tonometry, Ocular; D058609:Visual Field Tests / Q000379:methods*; D014794:Visual Fields