Friday, 13 April 2018

Dog Vision vs. Human Vision: A Life Changing Owner Learning


Don't adjust your screens...this is the same post cataract surgery walkies photo of Oli as shared here, adjusted to represent a typical healthy dog's view of the same scene.   When trying to better understand the differences between human vision and our dog's vision so that we could better assist our senior Oli with his post-cataract surgery visual deficits, I had a (long overdue) lightbulb moment that changed everything for us in how we approach our dogs' view of the world. I knew that dogs didn't perceive colour the same way as we did, but never understood the potential implications of dog vision vs. human vision and how I could use that knowledge to better support our dogs with visual cues as well as boost their general fun. 

As Oli's eye sight declined, we turned to contrast, brightness, and colour to help him navigate the world. My natural pull to relative sedate clothing colours gave way to a walkies wardrobe of vibrant pinks, purples, and bright whites to help Oli as I sought to distinguish myself from the natural world around us at the beach (black sand) and favourite local trails (heavily forested).  When his vision was significantly altered through his cataract surgery and recover, I upped my game even further, but it turns out that  I was going about things all wrong. The easy to understand website and image processing tool at Dog-Vision.com sparked an ah-ha moment of realisation.  As someone who has studied light and colour, I turned to my familiar world of the RGB colour wheel to better grasp the differences.  Instead of looking at the colour shifts in the usual rainbow or spectrum, I created a colour-wheel based RGB breakdown and processed it through the Dog-Vision tool, first for colour only and then for both colour and brightness. The results are consolidated below along with some examples of how these differences would translate into some "brightly coloured" real-life scenarios with toys, treats, and everyday life:


Wow! What a difference!  It also warrants noting that these adjustments are for typical visual differences, and Oli's post cataract surgery visual acuity is significantly lower than a typical healthy dog's eyesight.  Typically, dogs see on a spectrum of blue-yellow as these are their base colour receptors (cones), are less sensitive to shades (brightness/contrast discrimination), have a lower visual acuity, and tend to be near-sighted; however, dog vision is significantly better suited towards peripheral views, low-light vision, motion detection, and depth perception than ours. Predator skills.

The realisation of how different dog sight is and what that means for their view of the world made me a little sad at first. What is a world of ever changing colour and interest to us is much of a muchness to them (see my four season example below), but dogs "see" the world through smell in ways we can only imagine. And frankly, probably wouldn't want to if we could! Haha!  Check out this awesome TED-Ed clip on how dogs "see" with their noses


What will our new and improved dog vision understanding change for us and our dogs? The biggest change in our Oli care is what we wear on walkies - lots more blue for our usual city, park, and forest walks to ensure that we are distinct in a world of yellow and greige, and some yellows to ensure we can be seen on blue sky blue water beach days (we have black sand, so yellow is a clear difference for us). More on that in an upcoming post.

For things like ready-made toys, we'll think about how the toy colour plays against the backdrop of our carpets/flooring or green grasses for outdoor toys.  All these years of red, yellow, and orange balls in green grass - who knew?  Bright blue is my new go-to colour for outdoors, for us and the dogs to see against a green backdrop.
  



For homemade toys, there may be a few changes here on the blog, but not quite as significant. Many of the toys we make are for special occasions and styled for a combination of doggy fun with human preferences, especially holiday/occasion toys. For example, Humphrey LOVES his triangle toys, but really couldn't care less which one was in play - they were a great size and shape for wild play, tough, textured, and had squeakers. Fun in any colour!


Where toys and other things are being made just for fun, colour theory will come into play a little more, such as ensuring tugs have good colour variation from a dog's perspective (like this follow-on post).


For our homemade treats, little will change. Colours are mostly to suit our human preferences, especially holiday/occasion treats, or just a natural by-product of using colourful ingredients. We always say in our posts that the dogs don't care about looks, just smell/flavour. This just reinforces that further. :)

Take a few photos of your favourite walkies outfits, walking places, dog toys, or other dog-related things and pop them through the quick and easy free image processing tool at Dog Vision for a look at life through your dog's perspective and think about what you might change to make life better or more fun.  It's a genuine eye opener (no pun intended...) and well worth a few minutes of your time.  We'd love to hear your thoughts, ideas, suggestions, changes, and more - leave us a comment or get in tough with us on social media. Woofs!

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