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Scuba Forum / General / August 2007Contact lenses that will replace a mask?
Hi there, Not surprisingly, given Wikipedia's reputation for inaccuracy, the entry for frogmen seems a little far-fetched. Quote: Some frogmen use a mouthpiece and noseclip or a mouth-and-nose (oro- nasal) breathing mask instead of a diving mask with eye windows, and special contact lenses to correct the vision refraction error caused by the eyeballs being directly submerged. This is to avoid a searchlight or other lights reflecting off the mask window and thus revealing his presence, but it exposes the eyeballs to any pollution, poison, or organisms in the water. End Quote. Contact lenses that replace a mask? Wouldn't contact lenses wash out underwater? Googling this unique bit of technology has revealed nothing more than lots of copying and pasting of the Wikipedia article, so I thought I'd ask some actual scuba divers. Does this technology exist? What would the contacts look like, if indeed they exist. Would they need to flatten out the cornea or make it thicker? Thanks very much for your help! Charl On Aug 9, 4:29 am, Charl_from_Lexi...@hotmail.com wrote: > Contact lenses that replace a mask? Wouldn't contact lenses wash out > underwater? Superglue. > Googling this unique bit of technology has revealed nothing more than > lots of copying and pasting of the Wikipedia article, so I thought I'd > ask some actual scuba divers. Does this technology exist? What would > the contacts look like, if indeed they exist. Would they need to > flatten out the cornea or make it thicker? I believe MI6 has something like this for their "00" agents, to accompany the pen-sized scuba unit. > On Aug 9, 4:29 am, Charl_from_Lexi...@hotmail.com wrote: > [quoted text clipped - 11 lines] > I believe MI6 has something like this for their "00" agents, to > accompany the pen-sized scuba unit. I heard they dropped that plan. Agent 001 inhaled the respirator unit on the first breath, and apparently the wireless micro-spg is lodged somewhere between his buttcheeks. They figger that once the pressure builds in his bowels from the powered-flow semi-closed micro- rebreather, it'll blow the spg out. Recovering the reg system is still a conundrum. Dunno what they decided about the Corneal masks. JF > > On Aug 9, 4:29 am, Charl_from_Lexi...@hotmail.com wrote: > [quoted text clipped - 20 lines] > > JF I've actually heard rumor of a similar setup...if you'e ever watched the making of that awful chevy chase invisible man movie, they used gigantic blue contact lenses to allow him to appear to have invisible eyes in front of a blue screen. The lenses themselves are far larger than traditional lenses and cover most of the front of the eye. Apart from being uncomfortable as hell, my assumption is that the larger surface area would keep them in your eyes...just a thought. > > > On Aug 9, 4:29 am, Charl_from_Lexi...@hotmail.com wrote: > [quoted text clipped - 28 lines] > from being uncomfortable as hell, my assumption is that the larger > surface area would keep them in your eyes...just a thought. Sclera lenses? Those are NASTY. You can only wear them for 4 hours and they stop you from rolling your eyes. A career as a frogman is getting less appealing all the time... ;-) > > > On Aug 9, 4:29 am, Charl_from_Lexi...@hotmail.com wrote: > [quoted text clipped - 28 lines] > from being uncomfortable as hell, my assumption is that the larger > surface area would keep them in your eyes...just a thought.- Any freedivers here? How deep can you go before the pressure on the eye's orb alone gets to be too much? JF > Any freedivers here? How deep can you go before the pressure on the > eye's orb alone gets to be too much? The freedivers I know use masks. > Any freedivers here? How deep can you go before the pressure on the > eye's orb alone gets to be too much? The only ones who can tell you will probably have trouble reading your post. Does the eyeball actually implode or would it just irreversibly compress and give the free diver permanent little mole eyes? > > Any freedivers here? How deep can you go before the pressure on the > > eye's orb alone gets to be too much? [quoted text clipped - 4 lines] > Does the eyeball actually implode or would it just irreversibly > compress and give the free diver permanent little mole eyes? I'll answer myself: "If this negative pressure becomes great enough, the eyes and ocular adnexa are drawn towards the space. Marked lid edema with ecchymosis and subconjunctival hemorrhage may develop as tissues and blood vessels are disrupted by this distention. These signs may be alarming to the diver but typically resolve without sequelae. In a more severe case, such as that which may occur when an unconscious diver sinks a significant distance in the water column, more serious injury, including hyphema, may occur." So my adnexa are in danger of ecchymosis or even hyphema. Figures. Does anyone have a clue what that means? Fine, I'll answer myself again: ad?nex?a ( d-n k's ) Pronunciation Key pl.n. Accessory or adjoining anatomical parts, as ovaries and oviducts in relation to the uterus. ec?chy?mo?sis ( k' -m 's s) Pronunciation Key n. The passage of blood from ruptured blood vessels into subcutaneous tissue, marked by a purple discoloration of the skin. hyphema noun bleeding into the interior chamber of the eye Ouch. I don't think I like the latter. That still doesn't tell us how deep, though. We need a volunteer, someone dedicated to dive safety, someone to whom a brain implosion won't make a heck of a difference. I nominate Joe English. Any seconds? >>>Any freedivers here? How deep can you go before the pressure on the >>>eye's orb alone gets to be too much? [quoted text clipped - 20 lines] > Does anyone have a clue what that means? Fine, I'll answer myself > again: What it means is this: yer gonna get one helluva mask squeeze if yer nose is not inside the mask to equalize the pressure! That's why we gave up on eye goggles and nose clips a long long time ago. I can't find them used after the SG Proto rebreather, almost a hundred years ago. But today's divers will piss away money on anything they think is new. Wanna buy the latest in gutta percha diaphragm single stage regs? esg >>>Any freedivers here? How deep can you go before the pressure on the >>>eye's orb alone gets to be too much? [quoted text clipped - 19 lines] > > Does anyone have a clue what that means? What it means is that yer gonna get one helluva mask squeeze if yer nose is not inside the mask to equalize pressure! That's why we quit using eye goggles and noseclips a long long time ago. I can't find them in use after the SG Proto rebreather, almost a hundred years ago. But today's divers will piss away money on anything they think is new. How about bringing back the gutta percha diaphragm single stage reg - just call it the latest in life support equipment and charge two grand a copy. It'll sell like crazy! esg > > > Any freedivers here? How deep can you go before the pressure on the > > > eye's orb alone gets to be too much? [quoted text clipped - 39 lines] > won't make a heck of a difference. I nominate Joe English. Any > seconds? Bubba? > > > > On Aug 9, 4:29 am, Charl_from_Lexi...@hotmail.com wrote: > [quoted text clipped - 31 lines] > Any freedivers here? How deep can you go before the pressure on the > eye's orb alone gets to be too much? There is no problem with depth if freediver uses contacts or liquid filled goggles (liquids almost don't compress with depth). The problem arises when air filled mask is in use. Then it must be equalized the same way as we do during scuba dive because bugeyed diver is not very pretty sight. Janusz >> > > On Aug 9, 4:29 am, Charl_from_Lexi...@hotmail.com wrote: >> [quoted text clipped - 37 lines] > > JF Well, if you've ever had a mask squeeze you have to equalize the pressure inside your mask making the pressure inside the mask the same as the pressure outside. I know they used to make hard contacts for sports that were oversized so your lids held them in instead of just surface tension. I don't think they make them anymore. Contacts that change your eye color and contacts for the movies are another story. > > On Aug 9, 4:29 am, Charl_from_Lexi...@hotmail.com wrote: > [quoted text clipped - 20 lines] > > JF Now there's a secret scuba set up - absorbing air through the lower colon. Wouldn't want to be in the same room when he breathed out... > On Aug 9, 4:29 am, Charl_from_Lexi...@hotmail.com wrote: > > > Contact lenses that replace a mask? Wouldn't contact lenses wash out > > underwater? > > Superglue. Never! Some people are allergic to it. I would rather recommend duct tape. Janusz > > Googling this unique bit of technology has revealed nothing more than > > lots of copying and pasting of the Wikipedia article, so I thought I'd [quoted text clipped - 4 lines] > I believe MI6 has something like this for their "00" agents, to > accompany the pen-sized scuba unit. On Aug 9, 3:19 pm, "janus...@hotmail.com" <janus...@hotmail.com> wrote: > > On Aug 9, 4:29 am, Charl_from_Lexi...@hotmail.com wrote: > [quoted text clipped - 5 lines] > Never! Some people are allergic to it. I would rather recommend duct > tape. Don't forget that you'd have to attach some kind of framework to keep 'em from squashing yer eyeballs against yer brain. Duct tape would implode. I can picture little teeny superstiff wires bonded to the surface of the lens and arching out to press on your forehead and cheeks somehow. I suppose one could pressurize one's eyeballs and cranium from within somehow to counteract the external pressure. JF > On Aug 9, 3:19 pm, "janus...@hotmail.com" <janus...@hotmail.com> > wrote: [quoted text clipped - 12 lines] > 'em from squashing yer eyeballs against yer brain. Duct tape would > implode. Not if there would be some holes in the tape. Nail recommended, but not too many http://images.usatoday.com/news/_photos/2004/05/05/nail-skull.jpg Janusz >I can picture little teeny superstiff wires bonded to the > surface of the lens and arching out to press on your forehead and > cheeks somehow. I suppose one could pressurize one's eyeballs and > cranium from within somehow to counteract the external pressure. > > JF >> On Aug 9, 3:19 pm, "janus...@hotmail.com" <janus...@hotmail.com> >> wrote: [quoted text clipped - 15 lines] >not too many >http://images.usatoday.com/news/_photos/2004/05/05/nail-skull.jpg Ach!! But grossness aside, wouldn't that be like punching holes in my drysuit to relieve the squeeze? JF > On Thu, 09 Aug 2007 23:51:51 -0700, "janus...@hotmail.com" > [quoted text clipped - 25 lines] > > JF Basically - Yes. Fortunately instead of drysuit duct tape is single use item. BTW it's good that you have mentioned drysuit. Now we have diver without mask (contacts), equipped with pen size rebreather - how to inflate drysuit? Janusz On Aug 10, 11:44 am, "janus...@hotmail.com" <janus...@hotmail.com> wrote: > Basically - Yes. Fortunately instead of drysuit duct tape is single > use item. > BTW it's good that you have mentioned drysuit. Now we have diver > without mask (contacts), equipped with pen size rebreather - how to > inflate drysuit? Dry suit? This is the British Secret Service we're talking about. Nothing but the best wash-and-wear tuxedos for their agents. Come straight from a recon dive right into the casino for a few hands of baccarat and a dry martini. I believe they're using a classified neoprene-silk blend that provides stellar thermal protection and dries wrinkle-free almost immediately. Henderson will have a version out in 2009. > On Aug 10, 11:44 am, "janus...@hotmail.com" <janus...@hotmail.com> > wrote: [quoted text clipped - 12 lines] > wrinkle-free almost immediately. Henderson will have a version out in > 2009. Bushwa! I've been diving that suit for twenty years! esg > On Aug 10, 11:44 am, "janus...@hotmail.com" <janus...@hotmail.com> > wrote: [quoted text clipped - 12 lines] > wrinkle-free almost immediately. Henderson will have a version out in > 2009. OMG your knowledge is outdated. Tuxedoes were used during Cold War. At present "00"s get white jalabiyas (tuxedo looks funny in places they have job to do) and this dress doesn't provide good thermal protection during swim from GB, so drysuit is necessary. Janusz > On Aug 9, 4:29 am, Charl_from_Lexi...@hotmail.com wrote: > > > Contact lenses that replace a mask? Wouldn't contact lenses wash out > > underwater? > > Superglue. Of course, that would explain all those secret agents with coke bottle thick glasses. They were once frogmen and they can't get those damned contacts out. ;-) > > Googling this unique bit of technology has revealed nothing more than > > lots of copying and pasting of the Wikipedia article, so I thought I'd [quoted text clipped - 4 lines] > I believe MI6 has something like this for their "00" agents, to > accompany the pen-sized scuba unit. I heard those pen-sized scuba units were made out of depleted uranium, for strength. But the radiation made the agent grow gills, so they weren't needed after a few weeks. On 9 Sie, 13:29, Charl_from_Lexi...@hotmail.com wrote: > Hi there, > [quoted text clipped - 25 lines] > > Charl http://www.otticarocchi.com/ENG/home_ENG.htm BTW they are terribly expensive and some freedivers use liquid filled swimming goggles to protect them. Janusz > On 9 Sie, 13:29, Charl_from_Lexi...@hotmail.com wrote: >> Hi there, [quoted text clipped - 45 lines] > > Janusz Many freediver during thier record wear it, they don't need to waste air equalizing a mask, but usually they wear ithem without swimming googles, for what I'm seeing Perezoso > <janus...@hotmail.com> wrote in message > [quoted text clipped - 55 lines] > > Perezoso Right. Swimming goggles are mostly used during training to avoid losing contacts. Of course there are also liquid filled goggles, which are used without contact lenses. Janusz > Hi there, > [quoted text clipped - 25 lines] > > Charl How old is this quote? And/or is this from a science fiction novel -- like "real" frogmen" As far as I know, due to the nature of water and how our eyes work, we humans must have an air space between our eyes and the water. > <Charl_from_Lexi...@hotmail.com> wrote in message > [quoted text clipped - 33 lines] > "real" frogmen" As far as I know, due to the nature of water and how our > eyes work, we humans must have an air space between our eyes and the water. Wrong, wrong and once again wrong. Janusz |
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