What is a symptom of oxygen toxicity related to vision?

Tunnel vision is a symptom of oxygen toxicity related to vision because, in cases of prolonged exposure to high concentrations of oxygen, particularly at depths greater than 10 meters (33 feet) in diving, the nervous system can be adversely affected. This can lead to a narrowing of the visual field, or tunnel vision, making it difficult for the diver to see peripherally. Tunnel vision occurs due to changes in the retina or the optic nerve as they respond to the increased partial pressure of oxygen.

In this context, light sensitivity, blurry vision, and double vision, while they can also be associated with various forms of visual disturbances, are not specifically indicative of oxygen toxicity in the same way tunnel vision is. Light sensitivity can occur due to many environmental factors or conditions, blurry vision may result from different types of visual impairment or focus issues, and double vision pertains to misalignment of the eyes or nerve dysfunction that might not be strictly related to oxygen toxicity. Thus, tunnel vision is the most relevant symptom in the context of oxygen toxicity affecting vision.