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Pedantry alert at 20 ft breathing pure O2 you are actually breathing a PPO2 of 1.6 bar (or ata). That's the accepted limit for a non exercising diver. At 33 ft, you'd be at a PPO2 of 2 bar. A standard hyperbaric treatment for diving injuries is at 2.8 bar PPO2. 6 hours of that and your lungs...

This should be a short term thing - stems from disssolved O2 in the eyes being respired and hence changing the pressure of the lense / eyeball. There is medical literature about the effect and duration. (I was a subject in some research on this and read a few of the relevant papers at the time)...