Intersession variability of short-wavelength automated perimetry

Background. Short wavelength automated perimetry (SWAP) is a sensitive meth od in detection of early glaucomatous damage. In this study, we compared in tra-subject variability of global indices of SWAP and conventional white-on -white perimetry (WWP) in normal clinical conditions (without correction fo r lens yellowing). Methods. SWAP and WWP (Humphrey field analyzer, 24-2 field, full threshold strategy) was performed in 68 eyes with glaucoma or glaucoma suspect and at the same day. The tests were repeated within 45 days (mean follow-up 16+/- 13 days). Results. At the follow-up test the mean defect was significantly reduced fo r both conditions, more pronounced for SWAP. Pattern standard deviation rem ained statistically equal for both conditions. The coefficient of correlati on of baseline to follow-up was for SWAP PSD 0.88 with a slope of 1.05 for WWP PSD 0.7 with a slope of 0.83. The coefficient of variation for PSD was 17% for SWAP and 34% for WWP. Conclusions. The low intraindividual variability of SWAP enables early dete ction of glaucomatous field damage in the followup.