Hootis
Guest
Two seperate issues, first is optical illusions following repeated exposure to PPO2's of 1.4 for a couple of dive days while rebreather diving. Both times this phenomon have occured, the oxygen exposure limits were not extreme. The first occurance was on day two of a week long dive trip. Dive was to 100fsw for 60 min flying my rebreather at 1.4. Decompression was minimal and I was very conservative. After two hours out of the water...feeling fine....I began to have optical disturbances best described as 10-20 spots of blur about 1" in diameter, arms length away, moving like a swarm of bees through my field of view. Subsided after 15-30 minutes. The next time this occured (year later) I was 6 dives into a two week trip. Biggest exposure prior to the occurance was 175fsw for 30 minutes bottom time with conservative decompression and with no symptoms. The next dive (following day) was 100fsw for 20 min again at a setpoint of 1.4. Again, the visual disturbances were noted approx 2 hours after leaving the water...no other symptoms noticed. I've read some reports of oxygen myopia....not sure if this is consistent with the accounts that I've read. Another idea by a doctor friend of mine, was minor bends in the region of the optic nerve (brain.) Anyone else experience these symptoms, or have any other ideas.
Next issue I've noticed, is that I occasionally will get a stinging feeling in the skin (or tissues just below) in the region of my stomache. I believe this to be a from of skin bends. Some other (very well known and experienced) technical divers I've talked to privately about this issue have also experienced it. Anyone have any information on this? Seems to occur on deeper/longer dives, but without reason or rhyme. I've had it occur twice in my 12 year diving career...both times on dives that were not nearly what I would consider extreme. (but both times beyond the limits of recreational) Both times this occured, I could not attribute the occurance to any obvious outside factor. (Hydration, medications, lack of conservatisim in the decompression profile, etc.) Anybody else experience this?
Next issue I've noticed, is that I occasionally will get a stinging feeling in the skin (or tissues just below) in the region of my stomache. I believe this to be a from of skin bends. Some other (very well known and experienced) technical divers I've talked to privately about this issue have also experienced it. Anyone have any information on this? Seems to occur on deeper/longer dives, but without reason or rhyme. I've had it occur twice in my 12 year diving career...both times on dives that were not nearly what I would consider extreme. (but both times beyond the limits of recreational) Both times this occured, I could not attribute the occurance to any obvious outside factor. (Hydration, medications, lack of conservatisim in the decompression profile, etc.) Anybody else experience this?