Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Ikeda Koichi and Noda Koji and Yamaguchi Shoichiro,Visual Acuity as a Function of Luminance Contrast of Landolt Rings and Adaptation Luminance,JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN,00192341,The Illuminating Engineering Institute of Japan,1983,67,10,527-533,https://cir.nii.ac.jp/crid/1390282679060572800,https://doi.org/10.2150/jieij1980.67.10_527