J Korean Ophthalmol Soc.
1987 Jun;28(3):599-604.
The Examination of Cheongsan Vision Chart
- Affiliations
-
- 1Hahn's Eyes Hospital, Seoul, Korea.
Abstract
- 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.
