Hue discrimination in damage of chiasma opticum
Twenty persons (40 eyes) with various sizes of pituitary adenoma (PA) and forty (80 eyes) age-matched controls were tested. Computerized Farnsworth - Munsell (F - M) hue test program was used for colour discrimination. Visual acuity and perimetry were estimated. Patients were divided into two groups according to the diameter of PA: (i) less than 1 cm, and (ii) more than 1 cm. The mean error score of the F - M test in the first group was 131 and in second 244 when in the control group it reached 80 ( p<0.05). Visual acuity and visual field were statistically worse in the second group than in the first ( p<0.001). There was strong correlation between visual acuity, perimetry, and F - M 100 Hue test error scores. The greater was the diameter of PA, the worse were the visual functions and hue discrimination. Thus, hue discrimination can be one of the methods for early prediction of damage of chiasma in cases of pituitary adenoma.