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Nitrox max oxygen exposure question

Discussion in 'Advanced Scuba' started by ls1dreams, Jul 25, 2020.

  1. lv2dive

    lv2dive Formerly known as KatePNAtl

    # of Dives: I'm a Fish!
    Location: Lake City, FL
    2,795
    2,086
    Interesting. Can’t say ocular oxtox ever came up in any of my courses, or maybe I just forgot about it. It certainly wasn’t ever discussed on any of the teams I’ve been on.
     
    Storker likes this.
  2. Boston Breakwater

    Boston Breakwater "Outlaw." Solo Diver

    # of Dives: 1,000 - 2,499
    Location: Brunswick, Georgia.
    522
    497
    Hello. I'm not sure what your intention is? You said " Oxtox comes in two flavors I was pointing to another. You made a broad statement that was incorrect, and seem to be very combative. If, you want to further conversation....You can P.M. me. I gather you won't.....
    Cheers.
     
  3. The Chairman

    The Chairman Chairman of the Board Staff Member

    # of Dives: I just don't log dives
    Location: Cave Country!
    62,325
    30,893
    What is ocular toxicity? I've never heard of it before now and my Google fu shows a lot, but not with diving.
     
    Storker and Boston Breakwater like this.
  4. Storker

    Storker ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 100 - 199
    Location: close to a Hell which occasionally freezes over
    17,202
    13,600
    Answering a direct question

    Ah. I apologize. I was staying within what is relevant to scuba diving.
     
    Boston Breakwater likes this.
  5. Boston Breakwater

    Boston Breakwater "Outlaw." Solo Diver

    # of Dives: 1,000 - 2,499
    Location: Brunswick, Georgia.
    522
    497
    Hello, Pete. How are you? It's mentioned in two of the links I posted...It is generally associated with "Rebreathers." and Hyperbaric conditions.
    Excerpt from D.A.N.
    Ocular Toxicity.jpg
    It is not mentioned/taught at the "Nitrox." level, and not part of the courses curriculum to answer @Storker 's question.
    Cheers.
    Edit; Dam.........This could have been a new thread.
    Edit: After re-reading this? It wasn't my intention to "Hijack." the thread...My apologies.
     
    The Chairman and yle like this.
  6. rongoodman

    rongoodman ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Albany, NY
    5,371
    2,084
    I've never head of "ocular toxicity", although myopia and cataracts can result from long term elevated O2 levels, such as with hyperbaric treatments.
     
    Boston Breakwater likes this.
  7. The Chairman

    The Chairman Chairman of the Board Staff Member

    # of Dives: I just don't log dives
    Location: Cave Country!
    62,325
    30,893
    I've always treated auras, scintillating lights and such as early warning signals for CNS or narcosis shenanigans. It's happened to me twice on deep air and I've thumbed both dives immediately. I've been deeper on my SF2 with no such symptoms. Yeah, I don't do deep air anymore.
     
    Boston Breakwater and rongoodman like this.
  8. yle

    yle Instructor, Scuba

    # of Dives: 500 - 999
    Location: Southern California
    1,538
    1,302
    Just wanted to throw my hat in with the others: I haven't heard of "Ocular Toxicity" either, but you have my attention. My first impression was that excessive oxygen exposure will do something to my eyes, which for some reason seems much worse than pulmonary oxtox (although not as bad as the CNS version.)

    Always looking for more info and resources to share with students. Thanks!
     
    Boston Breakwater likes this.
  9. yle

    yle Instructor, Scuba

    # of Dives: 500 - 999
    Location: Southern California
    1,538
    1,302
    Yeah, this kind of statement is unfortunate, and it's generally the attitude expressed in the PADI nitrox course materials. Along the lines of "We're required to tell you about this, but you can forget all about it because it doesn't matter."

    Fortunately instructors are able to enhance the course with their own experience, and provide hypothetical scenarios for students to consider. I'm not sure what "dive your brains out" means, but when I talk about pulmonary oxygen toxicity in the nitrox course, I put together a series of five dives that, while aggressive, are possible and result in hitting the maximum on the DSAT table. It seems that a lot of students that want to take the nitrox class also are interested in more information about diving. I'd rather satisfy their curiosity with examples than tell them "oh, you don't have to worry about that."

    We also go through the details of how their computers keep track of their "oxygen clock", and I encourage them to keep an eye on it anytime they dive (even with air) just to get an idea of how much exposure they have on a typical day. Then they can decide what is significant to them, or not so significant.
     
  10. broncobowsher

    broncobowsher Solo Diver

    2,047
    1,526
    I've heard it called Hypoxic Myopia.
    A LOT of oxygen over a long time and it is generally a temporary case of mild near sightedness.
    I've heard of people keeping an eye chart and if the vision starts to drop off, time to take a break.
    This is fringe stuff. Repetitive scientific diving type of profiles. Not the recreational vacation profiles.
     
    rjack321 and Boston Breakwater like this.

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