Objective This study determined the prevalence of color-vision deficiency among male high-school students in a public school. Methods Male high-school students were screened for color-vision deficiency using 6 plates of the Ishihara pseudoisochromatic plates. All students with one or more errors were reexamined at a later date with the full 15 Ishihara plates and the Farnsworth D15 (FD15) test. A detailed history was taken and an ocular examination was conducted. Students who identified less than 10 plates correctly on the FD15 were classified as color-deficient and underwent the Farnsworth Munsell 100 hue (FM 100) test. The results were statistically analyzed. Results A total of 1,258 male high-school students, aged 12 to 16 years, were included in the study, 122 of whom failed the screening test. Of these, 106 completed the 15 Ishihara plates. Sixty-five failed and were classified as color-visiondeficient, of which 64 (98%) were deutans. Deutan was also the most common deficiency determined using the FD15 (78.95%) and FM100 (44.19 %) hue tests. Conclusion The prevalence of color-vision deficiency among male students in a public high school was 5.17% (65/1,258). The most common deficiency was the deutan type.
Color Vision Defects

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 compare the classification and severity of congenital color vision deficiency using a Nagel anomaloscope and Farnsworth Munsel 100-hue Test (FM 100-hue).METHODS: A total of 394 eyes of 197 patients diagnosed with congenital color vision deficiency were included. Examinations using a Nagel anomaloscope and FM 100-hue were performed, and color vision abnormalities were classified as a protan color defect or deutan color defect by each test, and the degrees of color vision abnormalities were compared.RESULTS: The tests showed 64.3% (p < 0.001) agreement in the classification of color vision deficiencies. The Nagel anomaloscope was able to classify all cases, whereas 143 eyes (36.3%) could not be classified using the FM 100-hue test. In the case of the same type of color vision abnormality in both eyes, 196 cases (99.5%) using the Nagel anomaloscope and 111 cases (56.3%) using the FM 100-hue were observed. Regarding the degree of color defect, there was a moderate positive correlation between the two tests (r = 0.43; p < 0.001). There were no significant differences in the total error scores between mild anomalous trichromacy and severe anomalous trichromacy as assessed using FM 100-hue (p = 0.087).CONCLUSIONS: The Nagel anomaloscope was a more appropriate test for discerning the degree of color defect and binocular classification. In severity assessments, there was a moderate positive correlation between the two test methods. However, there were no significant differences in the total error scores between mild anomalous trichromacy and severe anomalous trichromacy as assessed using FM 100-hue. Therefore, it was difficult to perform severity classification using the Nagel anomaloscope based on the total error score of the FM 100-hue test.
Classification ; Color Vision Defects ; Color Vision ; Humans ; Telescopes

The author surveyed on the 100 color blindness applicants among 7080 applicants for driver license with use of the Ishihara plate, and they were analysed with 6 kinds of test including Ishihara-Okuma's, Tokyo Medical College's, H-R-R'S, Hahn's, Farnsworth's Panel D-15 test, Hahn's Double 15-Hue test. The results are obtained as follows: 1. Frequencies as to types of defect (protan, deutan) given by the summarized final result were protan 19%, deutan 65%, unclassified 16%. The most frequent type of color defect was deutan. 2. Estimates extent of defect (mild, medium, strong) as given by the summarized final result were mild (Grade 1) 34%, medium (Grade 2) 29%, strong (Grade 3) 37%. 3. The complete coincidence between the summarized final result and the results of 6 kinds of test were Ishihara-Okuma's 47%. T.M.C.'s 48%, H-R-R's 40%, Hahn's 45%, Panel D-15 49%, and Double 15-Hue 55%. 4. The approximate coincidences within +/-1 in grade were Ishihara-Okuma's 66%, T.M.C.'s 63%. H-R-R's 71%, Hahn's 68%, Panel D-15 67%, Double 15-Hue 72%. 5. Estimating of protan, Double 15-Hue test and Panel D-15 test were most effective tests, and of deutan, H-R-R, T.M.C., and Hahan's tests were most effective tests. The 65 percents effectiveness in screening out the applicants with use of Ishihara's plates showed a requirement of two or more test plates for measuring the degree of color deficiency; i.e. one of Double 15-Hue test and Panel D-15 test and one of H-R-R. T.M.C., and Hahn's pesudoisochromatic tests.
Color Vision Defects ; Licensure* ; Mass Screening

Cerebral achromatopsia, which refers to a loss of color vision, is a rare complication of posterior circulation stroke. We report two patients who presented with achromatopsia and dyschromatopsia (incomplete form of achromatopsia) respectively after acute posterior cerebral artery infarction. Lingual and fusiform gyri within the occipito-temporal area are known to be responsible for color perception.
Color Perception ; Color Vision ; Color Vision Defects ; Humans ; Infarction, Posterior Cerebral Artery ; Posterior Cerebral Artery ; Stroke

PURPOSE: This study aimed to quantify the shift of colorimetric values in the Ishihara pseudoisochromatic test with aging of the plates. METHODS: Three sets of Ishihara pseudoisochromatic plates with different published dates (printed in 1971, 1983 and 2001) were tested. Positions matching 32 dots with 13 colors were chosen from each set and the colorimetric values with the CIELAB and HSB/HLS color systems were measured with a spectrophotometer. Lightness (L*), red-green (a*), blue-yellow (b*), chroma, red hue, yellow hue, and green hue values from each set were compared. RESULTS: L* and chroma values were significantly higher in the older versions. The a* values shifted to red (increased a*) and the b* values shifted to yellow (increased b*) with plate aging. CONCLUSIONS: Our results showed that the pseudoisochromatic plates had significant changes in color values and a directional shift with aging.
Color ; *Color Perception ; Color Vision Defects/*diagnosis ; *Colorimetry ; Humans ; Spectrophotometry ; Time Factors ; Vision Tests/*instrumentation

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.
Color Vision Defects* ; Color Vision* ; Compensation and Redress ; Diagnosis ; Humans ; Surveys and Questionnaires

It is well known that, optic nerve damage in glaucoma begins and proceeds before the glaucomatous visual field defects become evident. Recently, various diagnostic methods were introduced to detect early optic nerve damage in patients with suspected glaucoma, Using the Farnsworth-Munsell 100 Hue test and the Neitz anomaloscope, the incidence, severity, and patterns of color vision deficiency was investigated in 65 normal eyes, 24 ocular hypertensive eyes, and 64 glaucoma eyes to find out the relation between glaucomaand color vision deficiency. The incidence of color vision deficiency in the normal subjects, ocular hypertensives. and glaucoma patients were 20%, 25%, and 78.1% respectively, which confirmed the correlation of glaucoma to the occurrence of color vision deficiency(R2=0.63). The glaucoma patients with color vision deficiency were found to have more profound defect compared to the normal individuals or ocular hypertensives. Among the glaucoma patients, those with severe visual field defect showed more profound color vision deficiency compared to those with mild or moderate visual field defect(p<0.01). The patterns of color vision deficiency in glaucoma patients were tritanoid in 84%, and non specific in 16%, which signified the high correlation of glaucoma to the tritanoid defect(R2=0.66).
Color Vision ; Color Vision Defects ; Glaucoma* ; Humans ; Incidence ; Optic Nerve ; Visual Fields

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

Authors studied the acquired color vision deficit in diabetic patients. Two color vision test, Hahn's 15 hue test and City University Color Vision test(CUCV test), were applied to assess the color vision in 25 diabetic patients and 20 controls. Diabetic patients had significantly more color vision defect(59.2%) than controls on two color vision tests. The type of acquired color vision deficit in diabetic patients was tritan axis. The frequency of acquired color vision defect in diabetic patients was significantly higher in group with diabetic retinopathy than without diabetic retinopathy. In comparison between two color vision test, Hahn's 15 hue test was more sensitive than CUCV test was useful to evaluate the type of color deficit. Diabetic group treated with laser photocoagulation had the moderate or severe color vision defect, with tritan axis.
Axis, Cervical Vertebra ; Color Vision Defects ; Color Vision* ; Diabetes Mellitus* ; Diabetic Retinopathy ; Humans ; Light Coagulation