Ka. Baez et al., MOTION DETECTION THRESHOLD AND FIELD PROGRESSION IN NORMAL-TENSION GLAUCOMA, British journal of ophthalmology, 79(2), 1995, pp. 125-128
Psychophysical tests may demonstrate abnormalities of visual function
before the appearance of conventional visual field loss in glaucoma. M
otion detection thresholds (MDT) were measured in the normal fellow ey
e of 51 patients with confirmed normal tension glaucoma and initially
unilateral field loss. Humphrey visual fields from the initially norma
l eye covering a mean follow up of 3.4 years were assessed using point
wise Linear regression analysis. In 22 of the 51 eyes with normal visu
al fields at presentation, field deterioration occurred at one or more
Humphrey locations within a mean of 1.7 (SD 1.6) years. An initially
abnormal MDT test showed a sensitivity of 73% and a specificity of 90%
in predicting field deterioration within the cluster of four Humphrey
locations closest to the original MDT test site. Sensitivity was lowe
r (40%) in predicting progression at retinal locations distant from th
e MDT test site, though specificity remained high (90%).