Dogs’ Eyes Have Changed Since Humans Befriended Them • Hacker News Board

Re: Dogs’ Eyes Have Changed Since Humans Befriended Them

#41

Post by manmal » Tue, Jun 18, 2019, 7:19 AM UTC

quaa55 wrote: post #38

miahi wrote: post #34

Earlier quoted context omitted.

3. The flicker fusion issue mostly applies to cathode ray displays and moving pictures. Many LCDs use flickering light (PWM) for backlight, but usually at more than 200Hz. Better LCDs use linear current sources for backlight, so there's no flicker at all. An LCD should be fine even for dogs when static images are displayed.

well now i’m curious, since we have a handful of LED bulbs throughout the house. they flicker no doubt, detectable through the slow motion setting on my phone camera. any suggestions on what energy efficient bulbs to replace them with?!

There are plenty of flicker free LEDs available, you just have to check beforehand. AFAIK all Philips LEDs are flicker free now, or at least those branded as “EyeCare”.

Re: Dogs’ Eyes Have Changed Since Humans Befriended Them

#42

Post by [deleted] » Tue, Jun 18, 2019, 7:19 AM UTC

miahi wrote: post #34

Joakal wrote: post #26

This is a good opportunity to educate the general [HN] community about dogs: 1. They can only see blue/yellow. Not like humans' RGB. 2. They are short sighted. For far away objects, their sight is like a T-Rex, they can see moving objects, not stationary objects. Remain still, and they can't see you. Then again, they can smell you, especially if it's downwind. 3. Their flicker fusion threshold is higher than humans.…

3. The flicker fusion issue mostly applies to cathode ray displays and moving pictures. Many LCDs use flickering light (PWM) for backlight, but usually at more than 200Hz. Better LCDs use linear current sources for backlight, so there's no flicker at all. An LCD should be fine even for dogs when static images are displayed.

[deleted]

Re: Dogs’ Eyes Have Changed Since Humans Befriended Them

#43

Post by maccard » Tue, Jun 18, 2019, 7:50 AM UTC

jyriand wrote: post #40

NetOpWibby wrote: post #21

Earlier quoted context omitted.

Damn, I cannot wait to have a dog.

Getting a dog should not be an emotional decision. I have a dog and sometimes it's a lot of work. Feeding, pooping, pissing, neverending fur in the house and on my clothes, vet, constant attention seeking etc. Just to mention a few things. And if you need to travel you need a babysitter for your dog. It's easier if you have a backyard where the dog can chill.

Can confirm. I am sitting here with a 9 week old puppy that I've had since Friday. It's relentless at first.

Re: Dogs’ Eyes Have Changed Since Humans Befriended Them

#44

Post by poloniculmov » Tue, Jun 18, 2019, 8:50 AM UTC

maccard wrote: post #43

jyriand wrote: post #40

Earlier quoted context omitted.

Getting a dog should not be an emotional decision. I have a dog and sometimes it's a lot of work. Feeding, pooping, pissing, neverending fur in the house and on my clothes, vet, constant attention seeking etc. Just to mention a few things. And if you need to travel you need a babysitter for your dog. It's easier if you have a backyard where the dog can chill.

Can confirm. I am sitting here with a 9 week old puppy that I've had since Friday. It's relentless at first.

It gets better, but the first weeks are hell. I'm so glad my dog is not a puppy anymore, even though he was really cute.

Re: Dogs’ Eyes Have Changed Since Humans Befriended Them

#45

Post by brazzy » Tue, Jun 18, 2019, 9:04 AM UTC

https://www.smbc-comics.com/comic/wolves

Re: Dogs’ Eyes Have Changed Since Humans Befriended Them

#46

Post by henryackerman » Tue, Jun 18, 2019, 9:54 AM UTC

_bxg1 wrote: post #10

One of my favorite factoids is that the human-dog symbiosis evolved twice , in two unrelated corners of the world, at around the same time. It was meant to be.

Got a source on that? Seems like an interesting read.

Re: Dogs’ Eyes Have Changed Since Humans Befriended Them

#47

Post by vanderZwan » Tue, Jun 18, 2019, 10:04 AM UTC

Joakal wrote: post #26

This is a good opportunity to educate the general [HN] community about dogs: 1. They can only see blue/yellow. Not like humans' RGB. 2. They are short sighted. For far away objects, their sight is like a T-Rex, they can see moving objects, not stationary objects. Remain still, and they can't see you. Then again, they can smell you, especially if it's downwind. 3. Their flicker fusion threshold is higher than humans.…

> As well, did you know lights have a flicker? If you think it's bad, it's even worse for dogs which can lead to stress.

As someone who notices and gets really tired from the stroboscopic effects of cheap LEDs, I can only imagine how terrible that must be for dogs

Re: Dogs’ Eyes Have Changed Since Humans Befriended Them

#48

Post by throwitaway9 » Tue, Jun 18, 2019, 10:12 AM UTC

Joakal wrote: post #26

This is a good opportunity to educate the general [HN] community about dogs: 1. They can only see blue/yellow. Not like humans' RGB. 2. They are short sighted. For far away objects, their sight is like a T-Rex, they can see moving objects, not stationary objects. Remain still, and they can't see you. Then again, they can smell you, especially if it's downwind. 3. Their flicker fusion threshold is higher than humans.…

That's interesting. We switched to LED bulbs in our living room and after that our eldest dog would not settle, I thought maybe the bulbs had a low humming noise he didn't like but it could have been a flicker instead. We switched back and he was fine again.

Re: Dogs’ Eyes Have Changed Since Humans Befriended Them

#49

Post by hjk05 » Tue, Jun 18, 2019, 10:40 AM UTC

As first reading the title I thought: “Really, that’s very interesting” Then I realized that almost everything about dogs have changed since humans befriended them. They literally went from wolves to pugs. Taking that into consideration it’s not at all surprising that the eyes changed too. Of cause it’s still interesting to dive in exactly how they’ve changed.

Re: Dogs’ Eyes Have Changed Since Humans Befriended Them

#50

Post by Shivetya » Tue, Jun 18, 2019, 11:08 AM UTC

Joakal wrote: post #26

This is a good opportunity to educate the general [HN] community about dogs: 1. They can only see blue/yellow. Not like humans' RGB. 2. They are short sighted. For far away objects, their sight is like a T-Rex, they can see moving objects, not stationary objects. Remain still, and they can't see you. Then again, they can smell you, especially if it's downwind. 3. Their flicker fusion threshold is higher than humans.…

So, is fluorescent lighting in an area with dogs would be bad, or not? Is there method to determine which type of lighting is best? I expect even LED bulbs could flicker based on quality of the line.

Am I wrong in assuming incandescent bulbs would be better