Ishihara Color Blindness Test Plate

An Ishihara color blindness test plate consisting of a large circular field filled with densely packed dots of varying sizes. The background dots within the circle are shades of background_colors. Embedded in the center is the number hidden_number, formed by dots in contrasting shades of number_colors. The area outside the main circle is filled with darker, muted brownish-green dots, creating a seamless pointillism texture typical of medical optical illusions.