Learning effect of Humphrey Matrix frequency doubling technology perimetry in patients with open-angle glaucoma.
OBJECTIVE
To evaluate the learning effect of frequency doubling technology (FDT) perimetry using the Humphrey Matrix perimeter in patients with open-angle glaucoma with no perimetric experience.


METHODS
One eye each of 30 glaucoma patients who had no history of visual field testing underwent 3 Matrix tests using 24-2 program with full-threshold strategy. The parameters investigated to detect learning effect were test duration, reliability indexes, mean deviation (MD), pattern standard deviation (PSD), and the number of points with a p of <5% and <1% in the total and pattern deviation maps.


RESULTS
MD showed a larger defect at the first test (-13.64 +/- 1.63 dB) than at the second (-12.68 +/- 1.45 dB) and third (-11.69 +/- 1.48 dB) tests (p<0.05). A statistically significant reduction (p<0.05) in the number of points with a p <5% and <1% in the total deviation map was observed when repeating the examination. The values of test duration, PSD, fixation losses, false-positive rate, false-negative rate, and number of points with a p <5% and <1% in the pattern deviation map were not changed significantly (p>0.05).


CONCLUSIONS
Humphrey Matrix FDT perimetry showed a statistically significant learning effect on MD and the number of significantly depressed points of the total deviation map in glaucoma patients with no perimetric experience. It is probably necessary to obtain at least 3 repetitions to rule out the presence of a learning effect in such patients before providing useful results.
De Tarso Pierre-Filho
Paulo
P
Department of Ophthalmology, Santa Casa of Sobral, Sobral - Brazil. paulopierre@hotmail.com
Gomes
Paulo R P
PR
Pierre
Erika T L
ET
Pierre
Leandro M
LM
D000328:Adult; D000368:Aged; D005189:False Positive Reactions; D005260:Female; D005902:Glaucoma, Open-Angle / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012691:Serial Learning; D014786:Vision Disorders / Q000175:diagnosis*; D058609:Visual Field Tests; D014794:Visual Fields