does this apply to hyperbaric chamber therapy?
"Pulmonary and ocular toxicity result from longer exposure to increased oxygen levels at normal pressure."
On the other side Astronauts run pure oxygen at low pressure (8psi) in their EVA suits, it can be tolerated indefinitely.
8 psi is 0.54 atmospheric pressure, so breathing in 100% oxygen under that pressure would be similar to a 54% nitrox mix at surface. Not as bad as 100% at surface, but might still be something that a doctor would monitor for potential signs. It is important to remember that people tolerance for oxygen can vary between people, and that Astronauts is a heavily selected group in term of fitness and health.