Sakuma J T, da Silva J A, Velasco e Cruz A A
School of Medicine of Ribeirão Preto, University of São Paulo, Brazil.
Optom Vis Sci. 1991 Aug;68(8):666-9. doi: 10.1097/00006324-199108000-00014.
The variability of the repetition of visual acuity measurements with a log MAR acuity chart with five optotypes in each row of acuity was studied in four groups of subjects. In three groups the threshold was calculated by probability of seeing curves, but the optotypes were read in different orders. For the fourth group the acuity was taken as the smallest row discriminated. Estimating the threshold by a probability of seeing curve did not improve the threshold's stability. Poorer acuity was detected when the optotypes were read vertically. It is suggested that clinical visual acuity charts are not suitable tools for generating data points to be fitted by probability of seeing curves.
在四组受试者中，研究了使用每行有五个视标的对数最小分辨角（log MAR）视力表进行视力测量重复的变异性。在三组中，通过视见曲线的概率计算阈值，但视标以不同顺序读取。对于第四组，视力被视为可辨别的最小行。通过视见曲线的概率估计阈值并不能提高阈值的稳定性。当视标垂直读取时，检测到较差的视力。建议临床视力表不是用于生成要通过视见曲线概率拟合的数据点的合适工具。
