PURPOSE: To investigate the characteristics of congenital and acquired color vision defects with Seohan computerized hue test and SNU (Seoul National University) computerized color test and to help to discriminate between congenital and acquired color vision defect METHODS: from June 2003 to January 2004, patient with congenital and acquired color vision defect and visual acuities more than 20/30 underwent Seohan computerized hue and SNU computerized color tests. Their results were compared with each other. Quadrant analysis and RQ calculation were done. RESULTS: On Seohan computerized hue and SNU computerized color tests, congenital color vision defects showed mainly red-green color vision defects (p<0.01, paired t-test) while acquired color vision defects showed blue-yellow color vision defect(p<0.01, paired t-test). RQ had 95% sensitivity and 98% specificity with a standard of 1.5 by Seohan computerized hue test, and 96% sensitivity and 98% specificity with standard of 1.0 by SNU computerized color test, for the discrimination of congenital and acquired color vision defects (ROC curve, confidence interval 95%). CONCLUSIONS: Seohan computerized hue and SNU computerized color tests were effective to classify types of color vision defects and discriminate between the congenital and acquired color vision defects.
Color Vision Defects* ; Color Vision* ; Confidence Intervals ; Discrimination (Psychology) ; Humans ; Sensitivity and Specificity ; Visual Acuity

PURPOSE: This study was designed to investigate the characteristics and classification of congenital color vision deficiency (CVD) by the SNU computerized color test (SCCT) that was developed to sufficiently utilize the advantages of a computer. METHODS: Hardy-Rand-Rittler test (HRR test), Nagel anomaloscope and SCCT were performed on 60 eyes of 30 CVD patients and 30 normal subjects and the results were compared. RESULTS: In normal subjects, the error scores were all zero at all colors by SCCT. By SCCT protan color defectives showed a peak at hue 0 red in 7 eyes (29.2%), at hue 150 green in 3 eyes (12.5%), at hue 180 green in 18 eyes (75%), and at hue 330 red in 2 eyes (8.3%). By SCCT, deutan color defectives showed a peak at hue 0 red in 2 eyes (5.6%), at hue 150 green in 24 eyes (66.7%), at hue 180 green in 2 eyes (5.6%), and at hue 330 red in 23 eyes (63.9%). CONCLUSIONS: SCCT showed specific axes in CVD patients, with accuracy and high sensitivity to diagnosis. SCCT appears to be useful clinically as a color vision test to diagnose and classify CVD patients.
Classification* ; Color Vision Defects* ; Color Vision* ; Diagnosis ; Humans

PURPOSE: To investigate the color vision defect in diabetic patients using the SNU computerized color test (SCCT). METHODS: From May to September 2003, diabetic patients with visual acuity 0.6 or better underwent various examinations including biomicroscopy, fundus photography, Ishihara color test, Hardy?Rand?Rittler (HRR) test, Seohan computerized hue test (SCHT), and SNU computerized color test. The SCCT was developed by using the Matlab 6.0 program. RESULTS: A total of 160 eyes of 82 diabetic patients were included. Thirty-two patients had no diabetic retinopathy, 19 had mild nonproliferative diabetic retinopathy (NPDR), 12 had moderate NPDR, 12 had severe NPDR, and 7 had proliferative diabetic retinopathy (PDR). In the all diabetic patients, the average total error score (TES) of SCHT was 189 and that of SCCT was 8.5; in patients without diabetic retinopathy, the scores were 125 and 3.64; in patients with mild NPDR, 185 and 8.16; in patients with moderate NPDR, 209 and 11.1; in patients with severe NPDR, 288 and 15.6 ; and in patients with PDR, 324 and 17.6 respectively. On the HRR test, patients without diabetic retinopathy had 1 tritan defect; those with mild NPDR 2 tritan, 2 protan, and 2 deutan defects: those with moderate NPDR, no color defects ; and those with severe NPDR, 2 tritan, and 2 protan defects, and 1 deutan defect. CONCLUSIONS: In diabetic patients, TES of SCHT and SCCT was higher according to the severity of diabetic retinopathy. SCHT and SCCT were more useful than HRR test.
Color Vision Defects* ; Color Vision* ; Diabetic Retinopathy* ; Humans ; Photography ; Visual Acuity