The accuracy of vision test chart is very important in examination of the visual acuity. The author examined the accuracy of the Cheongsan Vision Chart which is an imitative print of Dr. Chun Suk Hahn's Vision Test Chartby measuring it's test types of Landolt's rings, Arabic figures, Korean letters and pictures in detail with micrometer and surgical loupe. The errors in size of test types of Cheongsan Vision Chart to the standard size which was authorized by the Ministry of Health and Social Affairs of Korea in 1972 for the Chun Suk Hahn's Vision Test Chart are found as follows: 1. Error in Landolt's rings. 0.2-32.7%, av. 9.0%. Error over+/-10% in 35.7%. 2. Error in Arabic figures. 0.1-70.4% av. 12.8%. Error over+/-10% in 47.6%. 3. Error in Korean letters. 0.2-55.9% av. 15.4%. Error over+/-10% in 57.1%. 4. Error in pictures. 0.2-15.1% av. 0.9%. Error over+/-10% in 8.1%. In this study the author found that the Cheongsan Vision Chart is lacking in accuracy for examination of visual acuity.
Aphakia ; Arabs ; Argon* ; Filtering Surgery ; Glaucoma ; Glaucoma, Angle-Closure ; Humans ; Korea ; Uveitis ; Vision Tests ; Visual Acuity

The test types used in three Korean test charts and "Hahn's New Test Chart" were measured in detajl to determine the accuracy with a caliper and micrometer which minimal limit of measurement was 1/10,000 inch. The rate of accuracy of three Korean test charts was noted as 82.3%, 72.8%, and 77.2% each, whereas that of the Hahn's New Test Chart was 98.9%.

Three hundred patients who have congenital colour vision deficiencies were examined at the author's eye clinic for 3 years (1987-1990) using 5 types of colour vision tests: Hahn's, TMC's, Okuma's (new), H-R-R's colour vision tests and Double 15 Hue Test (Hahn). The results obtained from each test were quite different in type and grade, and the summarized results were considered to be the best: Type: protan 23.3%, deutan 76.0%, unclassified 0.7% Grade: mild 20.3%, medium 25.3%, strong 54.4% The frequency of coincidence both in type and grade between the summarized results and those of each test were compared, and the highest was 62.3% in Double 15 Hue Test. The efficiency of the author's colour vision test and Double 15 Hue Test were evaluated with the data in this clinical trial, and they were found to be useful for classifying the type and estimating the grade of the congenital and also acquired colour vision deficiencies.
Adolescent ; Adult ; Child ; Color Perception Tests ; Color Vision Defects/*congenital/diagnosis ; Evaluation Studies as Topic ; Female ; Humans ; Male ; Middle Aged

No abstract available.

The author designed new pseudoisochromatic tests for detecting, classifying and estimating the degree of color defectives to meet the increasing need for a test of color vision in Korea. All colors used in these tests were theoretically selected from the isocolor zones for protan, deutan and tritan drawn in the C.I.E. chromaticity chart by Judd. The tests contain 16 plates with arabic figures and 5 with winding lines, and are divided in two sections: 12 tests for screening and 9 for qualitative and quantitative diagnostic tests.
Arabs ; Color Vision ; Diagnostic Tests, Routine ; Humans ; Korea ; Mass Screening ; Wind

1. A simplified vision test chart which is composed of test types of arabic figures and Landolt's rings for 0.1, 0.3, 0.5, 0.8 and 1.0 was designed by the author. 2. The test chart may be used at school for screeing the students who have decreased vision in early stage, and so school myopia can be prevented or cured by medical treatment. 3. It is also recommended to be used for testing the vision of students once every month at home to preserve good vision and prevent school myopia which is so much increased among the students that it has become a serious social problem in Korea.
Arabs ; Humans ; Korea ; Mass Screening* ; Myopia ; Social Problems ; Vision Tests*

1. A simplified vision test chart which is composed of test types of arabic figures and Landolt's rings for 0.1, 0.3, 0.5, 0.8 and 1.0 was designed by the author. 2. The test chart may be used at school for screeing the students who have decreased vision in early stage, and so school myopia can be prevented or cured by medical treatment. 3. It is also recommended to be used for testing the vision of students once every month at home to preserve good vision and prevent school myopia which is so much increased among the students that it has become a serious social problem in Korea.
Arabs ; Humans ; Korea ; Mass Screening* ; Myopia ; Social Problems ; Vision Tests*

72 subjects with defective color vision that was detected by the screening test among 633 high school students were examined using a printed sample of the author's plates and other 7 kinds of color tests including Ishihara's, Okuma's. Tokyo Medical College'sand H-R-R's plates, Farnsworth's Panel D-15 Test. Hahn's Double 15-Hue Test and Hahn's Color Choice Test (modified City University Colour Vision Test). Results of examination in classifying the types and estimating the extent of color defects using the author's plates were compared with the summarized final results obtained with 8 kinds of tests and the rate of coincidence of results both in type and in extent was found to be 33.3% in the author's plates, 37.5% in Okuma's, 36.1% in Tokyo Medical College's and 27.8% in H-R-R's plates.
Color Vision ; Humans ; Mass Screening

The Double 15-Hue Test was designed to classify the types of congenital defective color vision as protan, deutan and tritan, and also to estimate its extent as strong(grade 3), medium(grade 2) and mild (grade 1) defects. This is a paired dichotomous test: Test A and B. Test A is a modified Farnsworth's Panel D-15 Test for separating the subject with strong defect from those with medium and mild defects, while Test B composing more desaturated color chips is used to separate the subject with mild defect from those with strong and medium defects. The test was evaluated with 72 color defective students detected at two high schools using Ishihara's and the author's pseudoisochromatic plates, and it was proved to be very helpful for qualitative and quantitative diagnosis of defective color vision.
Color Vision ; Congenital Abnormalities ; Diagnosis ; Humans

The Double 15-Hue Test. designed by the author in 1977, was used to examine the color sense of 100 color defective subjects. Results and data obtained from the test showed that it is of more value than pseudoisochromatic plates in qualitative and quantitative diagnosis of the defective color sense because of its accuracy, simplicity and objectivity.
Diagnosis