What are the two kinds of vision?

• A. Day vision and night vision
• B. Peripheral and central vision
• C. Photopic vision (cone vision) and Scotopic vision (rod vision)
• D. Monochromatic and chromatic vision

Answer: (D)

Two kinds of vision refer to color processing: monochromatic versus chromatic. Monochromatic vision sees only brightness in grayscale, with no color discrimination. Chromatic vision uses the cone cells to perceive different wavelengths, giving color information. This distinction matters in inspection contexts because some indications are perceived mainly by color cues (chromatic) while others are detected by differences in brightness or shade (monochromatic). The other pairings describe different ways to categorize vision (such as by lighting conditions or retinal region), but the fundamental color-based split is between seeing in color and seeing in grayscale, which is why this option is the best choice.