transition lenses and lost bouy lights? - SailNet Community
Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.

 
LinkBack Thread Tools
post #1 of 10 Old 06-08-2010 Thread Starter
Member
 
Join Date: May 2009
Posts: 56
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
transition lenses and lost bouy lights?

Has anyone heard of this problem? A few weeks ago a sailing instructor brought to my attention a problem transition type eyeglasses may have during the evening/night time.

Apparently while sailing at night he was looking for a flashing bouy and knew it was close on his charts, but he could not see the flash. Something told him to pull his eyeglasses down and low and behold, he saw the bouy about 10 meters of the bow flashing bright as the morning Sun.

He figured the light was transitioning the glasses everytime it flashed. He made a comment about a collision that may have happened in the sailing community and the latest theory was that the lenses may have contributed to it.

Any ideas? Rumor? Myth? Opinon? Experiences?
trailblazer1229 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 10 Old 06-08-2010
Senior Member
 
nk235's Avatar
 
Join Date: Apr 2007
Location: Long Island
Posts: 404
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
I'm no expert on light transitioning glasses but my mother as well as a few of my friends wear them and they do not transition in the blink of an eye. They take a few seconds to transition from light to dark or vice versa depending on the light conditions but in no way does this happen rapidly. It leads me to believe that this aspect of the glasses did not have any affect on him not seeing the beacon. However it could have been the glasses possibly being blurry or the frames being in the way or maybe the GPS screen or some other light source was causing the glasses to be in a darkened state. I have been out many times fevourishly looking for a bouy that I knew was there and just not seeing it till the last second. (I don't wear glasses and have perfect vision). Sometimes being on the water in the night can play tricks with your eyes and mind. I think that is the more likely answer then the distant slight blink of a marker rapidly causing his glasses to shift from light to dark and then back to light again in a fraction of a second. Just my two cents.

-Nick

Morgan 323
nk235 is offline  
Quote Quick Reply Share with Facebook
post #3 of 10 Old 06-08-2010
the pointy end is the bow
 
erps's Avatar
 
Join Date: Aug 2006
Location: La Conner, Washington
Posts: 6,260
Thanks: 2
Thanked 27 Times in 26 Posts
Rep Power: 10
   
I've been wearing transition lenses for 30 years and haven't experience anything like that. I have had my vision degraded by dirty glasses though.

Ray
S.V. Nikko
1983 Fraser 41
La Conner, WA


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Boating for over 25 years, some of them successfully.
erps is offline  
Quote Quick Reply Share with Facebook
post #4 of 10 Old 06-08-2010 Thread Starter
Member
 
Join Date: May 2009
Posts: 56
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Funny that you mention the GPS. He did as well. Perhaps the light from the monitor dimmed his glasses to a point he couldn't see the bouy when he looked up. Good to know.
trailblazer1229 is offline  
Quote Quick Reply Share with Facebook
post #5 of 10 Old 06-08-2010
Mermaid Hunter
 
SVAuspicious's Avatar
 
Join Date: Oct 2006
Location: on the boat - Chesapeake
Posts: 3,984
Thanks: 0
Thanked 158 Times in 141 Posts
Rep Power: 9
 
Gross speculation here, but if the glasses are polarized presumably the polarization is independent of dimming. A private AtoN that uses an LED light might be cross-polarized and invisible through the glasses.

sail fast and eat well, dave
S/V Auspicious
AuspiciousWorks.com
beware "cut and paste" sailors.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
SVAuspicious is offline  
Quote Quick Reply Share with Facebook
post #6 of 10 Old 06-09-2010
Junior Member
 
Join Date: Jun 2010
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
I work for Transitions Optical. Original Transitions lenses are activated only by UV light, not visible light or light emitted from a GPS unit and, as somebody else had mentioned the change is gradual, not instant. In my own personal experience, I know my glasses need a good cleaning from the salt spray every time I come off the water. Perhaps it was that, or just could’ve been a coincidence.
Dmclean is offline  
Quote Quick Reply Share with Facebook
post #7 of 10 Old 06-09-2010 Thread Starter
Member
 
Join Date: May 2009
Posts: 56
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Quote:
Originally Posted by Dmclean View Post
I work for Transitions Optical. Original Transitions lenses are activated only by UV light, not visible light or light emitted from a GPS unit and, as somebody else had mentioned the change is gradual, not instant. In my own personal experience, I know my glasses need a good cleaning from the salt spray every time I come off the water. Perhaps it was that, or just could’ve been a coincidence.
Maybe we should get a techno-geek on this, but I am under the impression that LCDs and certainly CRTs (old style computer monitors) DO emit some UV light. Although the amount LCDs emits is less than CRTs. The UV in LCDs come from the flourescent lamps in them. The new LED LCDs don't have these flourescent lamps and apparently emit 0 UV.

However, I am not disputing the cause was other than this, I was just trying to get others experiences and thoughts. Answer me this Batman, staring at a GPS screen in the dark of night for extended periods of time, or staring at it to get a reading for say, 10-20 secs. Perhaps that is enough time to turn out the lights so to speak?
trailblazer1229 is offline  
Quote Quick Reply Share with Facebook
post #8 of 10 Old 06-09-2010
Senior Member
 
imagine2frolic's Avatar
 
Join Date: Aug 2008
Posts: 1,830
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 7
 
I just worked my way into Bahia de Cartegena in the middle of the night. Using eyesight with transition lesnses, binoculars 20 yrs old from Worst Marine, a laptop for a chart plotter. I have to agree with the others on the dirty lenses........i2f

20 MPH ain't fast unless, you do it in a 1000sq 3/2 house on 10foot waves
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


BORROWED, No single one of us is as smart as all of us!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
imagine2frolic is offline  
Quote Quick Reply Share with Facebook
post #9 of 10 Old 06-09-2010
Senior Member
 
AdamLein's Avatar
 
Join Date: Nov 2007
Location: SF Bay area
Posts: 1,914
Thanks: 5
Thanked 6 Times in 5 Posts
Rep Power: 8
 
The lenses wouldn't need to transition rapidly to block out the buoy light, as long as they were darkened by the time the wearer started actively looking for the buoy.

SVA: do you have a reason to believe that the light emitted from such LEDs might be polarized, or is that part of the speculation? The only ways I could think of polarizing the light would seem like unnecessary extra steps in the construction of such a buoy...

s/v Laelia - 1978 Pearson 365 ketch
s/v Essorant - 1972 Catalina 27
AdamLein is offline  
Quote Quick Reply Share with Facebook
post #10 of 10 Old 06-09-2010
美国华人, 帆船 教授及输送
 
Join Date: Sep 2006
Location: MD
Posts: 2,531
Thanks: 24
Thanked 23 Times in 15 Posts
Rep Power: 9
 
Quote:
Originally Posted by SVAuspicious View Post
Gross speculation here, but if the glasses are polarized presumably the polarization is independent of dimming. A private AtoN that uses an LED light might be cross-polarized and invisible through the glasses.
My guess is also on the polarizing effect of the lens.


Fine Print:
I am old school. Integrity is to do the right thing even when no one is watching.
rockDAWG is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome