**Core Concept:** Visual acuity is the clarity of vision at a particular distance, and it is measured using the logarithm of the minimum angle of resolution (logMAR) scale. Development of visual acuity is a crucial aspect of understanding visual maturation in children.

**Why the Correct Answer is Right:** Visual maturation starts in the fetal period and continues into early childhood. The visual system undergoes significant changes during this period, including the development of the retina, optic nerve, and visual cortex. In the first year of life, visual acuity improves significantly due to the development of the central nervous system and the formation of the primary visual pathways. In particular, the development of the fovea centralis, the region of the retina responsible for high-resolution vision, and the maturation of the optic nerve and visual cortex contribute to the improvement of visual acuity.

**Why Each Wrong Option is Incorrect:**

A. This option is incorrect as visual acuity begins improving during fetal life, making it too early.
B. Although visual acuity continues to improve after birth, it is not attained at 6 months as the primary visual pathways are not fully developed during this period.
C. Vision matures gradually, and the provided age range (from birth to 2 years) does not accurately represent the specific age at which visual acuity is attained.
D. This option is incorrect as visual acuity reaches a plateau at around 18-24 months, not achieving a normal level of visual acuity.

**Clinical Pearl:** The normal level of visual acuity is attained by approximately 2 years of age, a period marked by the maturation of primary visual pathways and improvement in retinal and cortical functions. It is essential for pediatricians and parents to monitor visual development in infants and children to identify any potential visual impairment or developmental delays.