Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




Fat bottom Trump
10150 posts

Uber Geek
+1 received by user: 4988

Lifetime subscriber

# 250790 25-May-2019 15:32
Send private message quote this post

I recently had an operation in one eye for cataracts. Both eyes have them equally, but of course only one at a time gets treated. 

 

Before the surgery, one of the more pronounced effects was vivid rainbow halos around bright light sources. This was really striking, especially apparent when looking at a full moon. It was exactly the same with both eyes. I know because I tested them many times over a long period. Closing either eye made no difference. The effect was the same.

 

After the operation I did the test again. As expected, the halo had disappeared with the operated eye. What was not expected, is that there is no longer any trace of it with either eye! I have tested this repeatedly. Not a glimmer of rainbow effect regardless of the eye.

 

The focus is what it should be, much sharper in the operated eye, still blurry in the other one, but no rainbow colours to be seen. How can this be? I assume it was the result of refraction in the cloudy lenses, but why should it also have vanished in the eye that hasn't been operated? Is this some trick of the brain? Can anyone enlighten me? I am intrigued.

 

 

 

 





I reject your reality and substitute my own. - Adam Savage
 


Create new topic
1358 posts

Uber Geek
+1 received by user: 164


  # 2245469 25-May-2019 18:51
Send private message quote this post

I suspect ye olde biological central CPU unit that sits in ones head is smart enough to select which eye it needs to use for vision.




Software Engineer

 


BoJo for PMUK?
3578 posts

Uber Geek
+1 received by user: 1203

Subscriber

  # 2245757 26-May-2019 07:22
One person supports this post
Send private message quote this post

It’s the well-known phenomenon - OPRR - optical parasympathetic rainbow rejection.

 
 
 
 


12959 posts

Uber Geek
+1 received by user: 4332

Trusted
Lifetime subscriber

  # 2245853 26-May-2019 14:17
Send private message quote this post

Odd. Did you ask your surgeon?

 

 

 

I get what are referred to as 'visual migraines' sometimes: curious geometric black and white patterns that march around like an old TV picture in the margins of your vision. They look like (at least, mine do) black and white zigzags.








Fat bottom Trump
10150 posts

Uber Geek
+1 received by user: 4988

Lifetime subscriber

  # 2245860 26-May-2019 15:09
Send private message quote this post

Funny. I have had those as well, though not for awhile. Scared the hell out of me the first time it happened. I will mention the missing rainbow when I see my surgeon tomorrow for the two-week checkup.

 

 





I reject your reality and substitute my own. - Adam Savage
 


755 posts

Ultimate Geek
+1 received by user: 144


  # 2254728 9-Jun-2019 10:56
Send private message quote this post

More intriguing than that, if you didn't have an artificial lens installed - as it used to be ages ago - you'd have been able to see ultraviolet.

 

 

 

https://petapixel.com/2012/04/17/the-human-eye-can-see-in-ultraviolet-when-the-lens-is-removed/


BoJo for PMUK?
3578 posts

Uber Geek
+1 received by user: 1203

Subscriber

  # 2254747 9-Jun-2019 11:20
Send private message quote this post

@Rikkitic Can you see this alright? 😀

 

 

 

 

 




Fat bottom Trump
10150 posts

Uber Geek
+1 received by user: 4988

Lifetime subscriber

  # 2254755 9-Jun-2019 11:39
Send private message quote this post

That's quite a rainbow flag. I did mention it to my eye surgeon but he wasn't really interested. I would love to be able to see ultraviolet like the bees do, but I wouldn't want to have to wear coke bottle glasses for everything else.

 

 





I reject your reality and substitute my own. - Adam Savage
 


 
 
 
 


Mad Scientist
20445 posts

Uber Geek
+1 received by user: 2788

Trusted
Lifetime subscriber

  # 2254782 9-Jun-2019 12:32
Send private message quote this post

Rikkitic:

 

I recently had an operation in one eye for cataracts. Both eyes have them equally, but of course only one at a time gets treated. 

 

 

Eh funny you say that, there are some eye surgeons who do both at the same time, to save on hospital costs. Presumably private hospital.





Swype on iOS is detrimental to accurate typing. Apologies in advance.


Mad Scientist
20445 posts

Uber Geek
+1 received by user: 2788

Trusted
Lifetime subscriber

  # 2254783 9-Jun-2019 12:33
Send private message quote this post

Rikkitic:

 

What was not expected, is that there is no longer any trace of it with either eye! I have tested this repeatedly. Not a glimmer of rainbow effect regardless of the eye.

 

The focus is what it should be, much sharper in the operated eye, still blurry in the other one, but no rainbow colours to be seen. How can this be? I assume it was the result of refraction in the cloudy lenses, but why should it also have vanished in the eye that hasn't been operated? Is this some trick of the brain? Can anyone enlighten me? I am intrigued.

 

 

Are you sure the eye is seeing anything at all





Swype on iOS is detrimental to accurate typing. Apologies in advance.


8333 posts

Uber Geek
+1 received by user: 4596


  # 2254953 9-Jun-2019 20:34
Send private message quote this post

pctek:

 

More intriguing than that, if you didn't have an artificial lens installed - as it used to be ages ago - you'd have been able to see ultraviolet.

 

 

 

https://petapixel.com/2012/04/17/the-human-eye-can-see-in-ultraviolet-when-the-lens-is-removed/

 

 

Wow - that's bizarre.

 

I have a friend with congenital aphakia (no lenses) - as described in the wiki article.

 

His eyesight is pretty awful - there's some reason - he's told me why but I've forgotten - they can't implant an artificial lens.

 

I'm red-green colourblind, I'm told that artists with red-green colourblindness often paint with unusual colours.  Problem is that to people who are similarly red-green colourblind  - like me - the paintings look completely normal.


Create new topic



Twitter and LinkedIn »



Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Scientists unveil image of quantum entanglement
Posted 13-Jul-2019 06:00


Hackers to be challenged at University of Waikato
Posted 12-Jul-2019 21:34


OPPO Reno Z now available in New Zealand
Posted 12-Jul-2019 21:28


Sony introduces WF-1000XM3 wireless headphones with noise cancellation
Posted 8-Jul-2019 16:56


Xero announces new smarter tools, push into the North American market
Posted 19-Jun-2019 17:20


New report by Unisys shows New Zealanders want action by social platform companies and police to monitor social media sites
Posted 19-Jun-2019 17:09


ASB adds Google Pay option to contactless payments
Posted 19-Jun-2019 17:05


New Zealand PC Market declines on the back of high channel inventory, IDC reports
Posted 18-Jun-2019 17:35


Air New Zealand uses drones to inspect aircraft
Posted 17-Jun-2019 15:39


TCL Electronics launches its first-ever 8K TV
Posted 17-Jun-2019 15:18


E-scooter share scheme launches in Wellington
Posted 17-Jun-2019 12:34


Anyone can broadcast with Kordia Pop Up TV
Posted 13-Jun-2019 10:51


Volvo and Uber present production vehicle ready for self-driving
Posted 13-Jun-2019 10:47


100,000 customers connected to fibre broadband network through Enable
Posted 13-Jun-2019 10:35


5G uptake even faster than expected
Posted 12-Jun-2019 10:01



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.