Efficacy of the Computer Program to Compensate Color Vision Deficiency using Seohan Computerized 85-Hue Test

PURPOSE: to study the utility of a program which diagnoses and compensates for color defects on computer monitors according to the severity and type of color vision deficiency (CVD). METHODS: Twenty-eight patients with congenital CVD completed Seohan computerized hue test, color compensated Seohan computerized hue test and questionnaire for preference of color compensated images. The relation between results of the Seohan computerized hue test and the degrees of color compensation was investigated. HRR test and Nagel anomaloscope were used for determining the severity and type of CVD. RESULTS: In applying the color compensation program, the total error score (TES) of the Seohan computerized hue test was significantly reduced. In cases of milder color vision defect, the TES of the color compensated Seohan computerized hue test was reduced at lower color compensations, while it was reduced at higher color compensations in cases of more severe color vision defect. In the color compensation of images, patients with milder color vision defects preferred images with lower color compensation and patients with more severe color vision defect preferred images with higher color compensation. CONCLUSIONS: The color compensation program for CVD effectively reduced the TES of Seohan computerized hue tests and improved the recognition of colors. This suggests that the program can be helpful to actual life in patients with CVD.

Seohan Computerized Hue Test(2): Total Error Scores According to the Age in Normal Subjects and Total Error Scores and Central Cap in Color Defectives

PURPOSE: To evaluate the clinical usefulness and its own characteristic of Seohan computerized 85-hue test(SCHT-85) which was developed by authors. METHODS: SCHT-85 was performed in 89 normal subjects and 41 subjects with color defects diagnosed by Hardy-Rand-Rittler test(HRR test) and Farnsworth Munsell 100-hue test(FM 100-hue test) and total error scores(TES) according to the age in normal subjects and TES and central cap in subjects with color defects were determined. RESULTS: In normal subjects, TES of SCHT-85 according to the age were slightly higher than those of FM 100-hue test and highly correlated with those of FM 100-hue test. TES of SCHT-85 were increased according to the degree of abnormality in the HRR test in subjects with color defects. TES of SCHT-85 were lower than those of FM 100-hue test in normal subjects and higher than those of FM 100-hue test in subjects with color defects. In subjects with color defects, the central cap of SCHT-80 showed the tendency to yellowgreen-purple axis in protan and green-bluepurple axis in deutan compared to that of FM 100-hue test. CONCLUSIONS: SCHT-85 is highly correlated with FM 100-hue test and seems to be more useful to differentiate normal subjects and subjects with color defects than FM 100-hue test.