Showing posts with label eyesigh. Show all posts
Showing posts with label eyesigh. Show all posts

Saturday 7 January 2023

If cats were human, they could be declared legally blind. True or false?

Answer: false in my view but we don't really know. If you are a human, living in the UK and perhaps elsewhere, you will be declared legally blind if your vision is 20/200 which means that if an object is 200 feet away you have to stand 20 feet from it in order to see it clearly.

Under daylight conditions, domestic cat eyesight is less good than humans'. However, under dusk and night time conditions it is better I would argue. Domestic cat eyes have evolved, as you know, to see under dusky conditions because that is when prey animals are around.

I was one of the first web owners to produce a pictorial comparison between domestic cat and human eyesight. Other websites have followed since. You can see that page by clicking on the link below:

Cat Vision Pictorial Examples

Two of the image comparisons are below.

How domestic cats see
How domestic cats see by MikeB

How domestic cats see
How domestic cats see by MikeB

What colors do cats see? Cat see colours pretty well but it believed they are colorblind to red or red/green (brown). The picture above is intended to replicate this color blindness. However, cats have superior eyesight in other respects which you can read about on the page linked to above the image.


The problem with deciding if domestic cats will be declared legally blind by human standards is that you can't really apply human standards to domestic cats. You hardly ever can.

Also, despite preparing a pictorial example of comparison we don't really know exactly how domestic cat see the world. We have a good idea but we don't know precisely how they see it.

In my considered opinion, they would not be declared legally blind partly because their eyesight is so good at night. And their field of vision is wider than that of humans.

Cat Field of Vision Compared to Human
Cat Field of Vision Compared to Human. Image: PoC.

The big problem with domestic cat eyesight is that they see colours less well than humans and the image is a bit softer.

They say that a dog's eyesight is a little better than that of cats.

I think we can probably argue that overall a domestic cat's eyesight is less good than that of humans because some of their other senses are superior to make up for this slight deficiency. They have a better sense of smell and better hearing.

Domestic cats use their sense of smell to identify objects and they can locate prey animals with their hearing very precisely. These senses compensate and when a cat's senses are bundled together, they are certainly equipped to the same level as humans.

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