Jonkers G H, Burger J
Doc Ophthalmol. 1991;78(3-4):219-23. doi: 10.1007/BF00165684.
The circumstances which can influence the determination of the static central visual acuity are enumerated. The TNO Landolt C chart can be improved. A modified Landolt C letter chart is introduced on which the optotype is presented in 8 different positions, in vertical rows of ten per visual step above visual acuity 0.3.
列举了可能影响静态中心视力测定的情况。TNO 兰多尔特 C 形视力表可以改进。介绍了一种改进的兰多尔特 C 形字母视力表，在视力高于 0.3 时，视标以 8 种不同位置呈现，每一个视力级别垂直排列十个。
