Final answer:
A child's visual acuity approximates adult levels at three to five years of age, with significant improvements in visual capabilities observable by six months.
Step-by-step explanation:
A child's visual acuity first approximates adult levels by three to five years of age. This development coincides with significant changes in a child's abilities, such as improved color perception and the maturation of depth perception. Around six months of age, an infant's vision has improved significantly, almost reaching the acuity of adult vision, allowing them to notice colors and demonstrate the ability to discriminate depth.