Which stage of hypoxia is characterized by some loss of night vision?

The stage of hypoxia that is characterized by some loss of night vision is known as the indifferent stage. During this phase, individuals may not experience significant impairment of cognitive or motor functions, but there can be physiological changes that affect the body's ability to utilize oxygen effectively. This stage typically begins at altitudes around 10,000 feet and corresponds to a decrease in the availability of oxygen. As a result, the ability to see in low-light conditions can be affected due to decreased oxygen levels for the photoreceptors in the eyes, leading to diminished night vision. Understanding the stages of hypoxia is crucial for flight paramedics, as recognizing these signs early can help in making informed decisions regarding patient care and safety during flight operations.