Which of the following is NOT a symptom of oxygen deficiency?

In situations involving oxygen deficiency, the body responds in various ways to the decrease in available oxygen. Common symptoms include light-headedness, increased heart rate, and shortness of breath, which are physiological responses to help the body cope with lower oxygen levels.

Visual clarity, however, is not a symptom associated with oxygen deficiency. In fact, as oxygen levels drop, one may experience confusion, impaired judgment, or deterioration in visual function rather than an enhancement of clarity. This lack of visual acuity can be attributed to the brain's impaired ability to process information effectively when deprived of adequate oxygen.

Thus, visual clarity stands out as not being part of the symptomatic response to oxygen deficiency, making it the correct choice in this case.