When do effects on vision begin at bac level?

Effects on vision can begin at a blood alcohol concentration (BAC) level as low as 0.02%. At this level, individuals may experience slight impairments in visual acuity and a reduced ability to track moving objects. As BAC increases, these effects become more pronounced, leading to blurred vision, difficulty focusing, and decreased peripheral vision. Significant impairments typically occur at BAC levels of 0.08% and above.