title: [Comparing the ranges of defect measured with standard white on white and Pulsar perimetries].
abstract: OBJECTIVE
  Normal thresholds on Pulsar perimetry fall faster than those of standard perimetry in the peripheral visual field. Two related studies were performed. Firstly, the frequency distributions of glaucoma defects on standard automated perimetry (SAP) and the relationship of the centre and periphery (Study A) were studied first, followed by an attempt to establish the limits of pulsar perimetry (Study B).
  
  
  METHODS
  A: frequency of defects was calculated in 78.663 SAP perimetries (G1-TOP, Octopus 1-2-3, Haag-Streit). Study B: 204 eyes with mean defect (MD-SAP) lower than 9 dB were examined 8.92 ± 4.19 times with SAP (TOP-32, Octopus 311) and temporal modulation perimetry (T30W, Pulsar Perimeter, Haag-Streit).
  
  
  RESULTS
  Study A: 50.7% of the SAP examinations showed MD values lower than 9 dB and 32.7% bellow 6 dB. The MD correlation of the central 20° with the MD of the most peripheral points was r=0.933. Study B: in cases with MD-TOP-32 lower than 6 dB, SAP had the maximum possibility of detecting defect in 0.02% of points and Pulsar in 0.29%. In subjects with MD-TOP-32 between 6 and 9 dB frequencies were 0.38% in SAP and 3.5% in Pulsar (5.1% for eccentricities higher than 20°).
  
  
  CONCLUSIONS
  Pulsar allows detecting defects, without range limitations, in the initial half of SAP frequencies expected on glaucoma patients. In order to study the progression of deeper defects the examination should focus on the central points, where the dynamic range of both systems is more equivalent.
authors.affiliation: Servicio de Oftalmología, Hospital Universitario de Canarias, Universidad de La Laguna, Islas Canarias, España. mgdelarosa@jet.es
authors.forename: M
authors.initials: M
authors.lastname: González de la Rosa
authors.forename: M
authors.initials: M
authors.lastname: González-Hernández
authors.forename: J
authors.initials: J
authors.lastname: García-Feijoo
authors.forename: M
authors.initials: M
authors.lastname: Sánchez Méndez
authors.forename: J
authors.initials: J
authors.lastname: García-Sánchez
mesh_terms: D042241:Early Diagnosis; D004867:Equipment Design; D005901:Glaucoma / Q000175:diagnosis; D006801:Humans; D012680:Sensitivity and Specificity; D058609:Visual Field Tests / Q000295:instrumentation / Q000379:methods*; D014794:Visual Fields