Nitrox max oxygen exposure question

[lv2dive]

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.

PADI rec nitrox cert? Can't remember they covered that. Is it part of that curriculum?

We were taught about CNS and pulmonary and got to play with the oxygen clock table. That was when I found out that for my kind of diving, pulmonary isn't an issue, so I basically watch my MOD.

 

[Boston Breakwater]

PADI rec nitrox cert? Can't remember they covered that. Is it part of that curriculum?

We were taught about CNS and pulmonary and got to play with the oxygen clock table. That was when I found out that for my kind of diving, pulmonary isn't an issue, so I basically watch my MOD.

Oxtox comes in two flavors: CNS and pulmonary. In principle, the two are independent. The former is acute, the latter is chronic. At depth, what you should worry about is CNS. Through the whole dive and the subsequent dives, what you should worry about is pulmonary.
Don't mix them up.

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.

 

[The Chairman]

Hello. You've actually omitted one. "Ocular Toxicity." I would "Expect." someone with your certification level to know this?

What is ocular toxicity? I've never heard of it before now and my Google fu shows a lot, but not with diving.

 

[Storker]

I'm not sure what your intention is?

Answering a direct question

You said " Oxtox comes in two flavors

Ah. I apologize. I was staying within what is relevant to scuba diving.

 

[Boston Breakwater]

What is ocular toxicity? I've never heard of it before now and my Google fu shows a lot, but not with diving.

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.

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.

 

[rongoodman]

I've never head of "ocular toxicity", although myopia and cataracts can result from long term elevated O2 levels, such as with hyperbaric treatments.

 

[The Chairman]

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.

 

[yle]

Hello. You've actually omitted one. "Ocular Toxicity." I would "Expect." someone with your certification level to know this?
OXTOX: If You Dive Nitrox You Should Know About OXTOX — DAN | Divers Alert Network — Medical Dive Article
http://tecvault.t101.ro/Diving and Hyperbaric Opthalmology.pdf
Alert Diver | Understanding Oxygen Toxicity.

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!

 

[yle]

"In recreational enriched air diving, pulmonary toxicity is highly unlikely. Staying within no stop limits and using EANx blends with 40 percent oxygen and less, you have to dive your brains out to get anywhere near your exposure limits."

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.

 

[broncobowsher]

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.