title: [Agreement and correlation between the frequency doubling perimetry and the blue-yellow perimetry in glaucoma: no support for selective damage].
abstract: OBJECTIVE
  To test the agreement and correlation between the frequency doubling technology and the short wavelength perimetry in glaucoma.
  
  
  METHODS
  Glaucoma patients were selected from the Glaucoma Sector of CEROF - Universidade Federal de Goiás, and then underwent frequency doubling technology and short wavelength perimetry examinations in both eyes (if eligible) on the same day in a random sequence. Pearson's correlation between the global indices (mean deviation - MD e pattern standard deviation - PSD) and the agreement between the examinations (Kappa) were obtained.
  
  
  RESULTS
  Forty-three eyes from 26 patients were included in the study. Comparing the MD (-4.5 +/- 4.5 dB for the frequency doubling technology and -8.0 +/-6.8 dB for the short wavelength perimetry, p<0.001) and PSD (6.4 +/- 2.8 dB for the FDT and 5.8 +/- 2.4 dB for SWAP, p=0.1), only MD was statistically different between the groups. The global indices MD e PSD were highly correlated between the frequency doubling technology and short wavelength perimetry (r=0.644, p<0.001 and r=0.586, p<0.001, respectively). There was a high agreement between the examinations (Kappa=0.319, p<0.001).
  
  
  CONCLUSIONS
  In the present study, a high correlation between the global indices (MD and PSD) by the frequency doubling technology and short wavelength perimetry was found, as well as a high agreement between the examinations. These observations indicate either that both cell populations are similarly affected by glaucomatous damage or that both methods measure activity in the same cell populations.
authors.affiliation: Setor de Glaucoma, Centro de Referência em Oftalmologia, Universidade Federal de Goiás, Goiânia, GO, Brasil. lmagacho@brturbo.com.br
authors.forename: Leopoldo
authors.initials: L
authors.lastname: Magacho
authors.forename: Ricardo
authors.initials: R
authors.lastname: Reis
authors.forename: Bernardo
authors.initials: B
authors.lastname: Magacho
authors.forename: Marcos Pereira
authors.initials: MP
authors.lastname: Avila
mesh_terms: D005260:Female; D005901:Glaucoma / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D058609:Visual Field Tests / Q000379:methods*