Aims: To compare the visual
field results of glaucoma patients, obtained with TOP and normal strategy.
Methods: 80 eyes of 80 glaucoma patients were tested using both normal
(G2) and TOP (tG2) strategy on Octopus 101 perimeter. Test duration, mean MD
and LV values were compared. The statistical analysis was performed on whole
group of patients and on 3 subgroups with different degree of visual field loss
(minimum, medium and deep) as well as 3 subgroups with different defect pattern
(generalized, localized, mixed), based on Brusini’s classification.
Results: Good correlations for both MD and LV were obtained (p<0,001) in all but minimal defect group,
where the correlation coefficient of LV values was 0,6430 (p<0,001). In minimal defect group the MD and
LV were slightly higher in TOP than in normal strategy (MD differnce=0,4dB,
SD=1,03, LV difference=1,15dB2, SD=4,4), in all other groups MD and
LV were higher in normal strategy. The highest MD difference was found in the
medium defect group, while the highest LV difference was found in the localized
defect group. The test duration was on average 13,5 minutes shorter in TOP than
in normal strategy.
Conclusions: TOP results correlate well with those obtained with the normal strategy and show similar defect patterns on the defect probability maps, although the TOP visual fields are “smoother” than those obtained with the bracketing procedure. None of the TOP results did “overlook” the defect found by the normal strategy, proving the usefulness of TOP in the diagnosis of glaucomatous visual field loss.