Can Oxygen be harmful?

Did you ever think about Oxygen being harmful? Probably not. So, now I will reveal a very astonishing fact about Oxygen. Even though Oxygen is our daily necessity, it could be as harmful as helpful it is. Oxygen could be toxic at elevated partial pressures which could lead to convulsions or other health problems. In the past, premature babies were put into incubators containing enriched O2 air, but this practice was discontinued after some babies turned out to be blinded because of the excess Oxygen. Oxygen is a very sensitive gas. It must always be balanced in the atmosphere. Slight increase or decrease in the Oxygen level could turn out to be catastrophic in some situations. Oxygen toxicity could occur in the lungs or central nervous system in deep scuba diving and surface supplied diving. But we need not be worried about the toxicity of Oxygen in our day to day life as our atmospheric oxygen level is equally balanced.