Fig 1.
Chromaticity points of the four tested color stimuli and the background.
We tested color visual acuity for red, green-yellow, blue-green and blue-purple using a paper-based chart with Landolt’s rings (test at 3 meters). The four colors are the same as those used in the New Color Test, a color arrangement test. The chromaticity points of each stimulus color and of the background (D65) are shown.
Table 1.
Characteristics of normal, preperimetric glaucoma and glaucoma eyes.
Fig 2.
Color visual acuity (VA) for different colors in normal, preperimetric glaucoma (PPG) and glaucoma eyes.
Color VA for all colors was similar in the normal and PPG eyes, as well as in the PPG and glaucoma eyes. Red (R) VA and blue-green (BG) VA were significantly lower in the glaucoma eyes than in the normal eyes (P = 0.008 and P = 0.015, respectively), although black-white (BW) VA, green-yellow (GY) VA and blue-purple (BP) VA were not significantly lower.
Fig 3.
Relationship between mean deviation (MD) and black-white visual acuity (VA) in preperimetric glaucoma (PPG) and glaucoma subjects.
Black-white VA was not correlated with MD in the eyes with PPG or glaucoma (r = -0.08, P = 0.45).
Fig 4.
Relationship between mean deviation (MD), red (R) visual acuity (VA) and green-yellow (GY) VA in preperimetric glaucoma (PPG) and glaucoma subjects.
R VA was significantly correlated with MD in the eyes with PPG and glaucoma (r = -0.23, P = 0.02, left), but GY VA was not (r = -0.09, P = 0.37, right).
Fig 5.
Relationship between mean deviation (MD), blue-green (BG) visual acuity (VA) and blue-purple (BP) VA in preperimetric glaucoma (PPG) and glaucoma subjects.
BG VA was significantly correlated with MD in the eyes with PPG and glaucoma (r = -0.25, P = 0.01, left), but BP VA was not (r = -0.02, P = 0.87, right).