Which of the following is NOT a visual clue to impairment?

The selection of "enhanced hearing" as the option that is not a visual clue to impairment is accurate because it relates to auditory perception rather than visual performance. In the context of standardized field sobriety tests, visual clues are typically behaviors or indicators that can be observed by the administering officer, such as the physical coordination and reaction times of the individual being tested.

Poor coordination, slow reactions, and impaired judgment are all observable actions or behaviors that manifest through visual cues. For instance, an officer may notice an individual's inability to maintain balance, their delayed responses to instructions, or inappropriate decision-making while performing tests. In contrast, enhanced hearing does not present as a visual characteristic and does not typically signify impairment in the same context. Instead, it suggests a heightened state of perception that would not be evident through observation alone. Thus, the correct answer effectively distinguishes between types of sensory observation relevant to identifying impairment.