Hiroshi HAMADA and Akira YUJIRI¹

Graduate School of Engineering, Hiroshima Institute of Technology, 2-1-1, Miyake, Saeki-Ku, Hiroshima 731-5193, Japan
¹Faculty of Engineering, Hiroshima Institute of Technology, 2-1-1, Miyake, Saeki-Ku, Hiroshima 731-5193, Japan

(Received November 12, 2003; Revised February 27, 2004; Accepted March 15, 2004)

We measured the entire region of mesopic and photopic vision to determine the color zone covering the visual field with unique red, yellow, green, and blue hue components. Eight kinds of test stimuli in the natural color system (NCS) color notation system were used. These stimuli were presented at horizontal and vertical meridians, and at meridians inclined at 45^° angles. The illuminance level was set at six levels: 0.01 lx–1000 lx. The evaluation method measured chromatic, white, and black components as well as the hue component of the stimuli. Results show that the color zone of the retina extended further into the periphery with increasing illuminance; the response of opponent colors y-b was shown to be greater than that of the opponent colors r-g.

Key words: peripheral vision, chromatic component, hue component, illuminance level, color zone map