Which of the following reaches adult levels the latest in life?

• A. Contrast sensitivity
• B. Color vision
• C. Accommodation
• D. CFF

Answer: (A)

Visual function maturation varies by component, and contrast sensitivity tends to develop more slowly than the others. Early on, infants can discriminate colors and show basic color vision, and their flicker fusion frequency (temporal vision) and accommodation improve quickly with growth, reaching near-adult performance by early childhood. Contrast sensitivity, however, depends on fine-tuned retinal signaling plus higher-level cortical processing for detecting subtle contrasts across a range of spatial frequencies. This neural development continues well into late childhood and often into adolescence, so adult-like contrast sensitivity is achieved later than color vision, accommodation, or flicker fusion.