A total of 17 cases (30 eyes) of glaucoma were tested for their contrast sensitivity (CS) with the VCTS 6000, without or with yellow or red filter lens. Test results showed that 1) the glaucoma patients′ CS curve was depressed at all the five spatial frequencies (1.5, 3, 6, 12, and 18 cycle/degree) tested; 2) the decrease was most significant at the 12 cycle/degree (e/d), which made the CS curve look like having a notch (v shaped); 3) the peak shifted to the left. Yellow filter lens could signifi-cantly increase the glaucoma patients′CS at 1.5, 3 and 6 c/d, especially at the peak (3c/d), leading to facilitation of mobility and adaptability in daily life. The red filter lens could improve CS at the peak but it decreased CS at 6, 12 and 18c/d, so it seemed that the red filter lens could not improve the visual function.