Bảng Kiểm Tra Mù Màu Ishihara

An Ishihara color blindness test plate featuring a large circular field densely filled with randomized dots of varying sizes. The background dots within the circle are shades of [olive green and yellow]. Embedded in the center is the number [67], composed of contrasting dots in shades of [muted red and coral]. The area outside the main circular plate is filled with darker, muted brownish-green dots, creating an authentic medical optical illusion in a seamless pointillism style.