How they see
How does a cat see the world?
Muted colour, unbeatable night vision
A cat's eyes are built for the hunt at dawn and dusk, not for admiring a sunset. Colour arrives washed-out and faint, and anything closer than about 25 centimetres blurs into a smudge, which is why a cat sniffs a treat held under its nose rather than staring at it. What it loses in colour and close focus it wins back after dark, when its eyes drink in the faintest light.
See through their eyes
Human ≈ 60 cpd (20/10)
How sharp is a cat's vision?
Its eyes resolve about 5 cycles per degree (20/120), while a human reaches around 60 cpd (20/10). Its field of view spans about 200°.
How does a cat see a human?
Its eyes resolve about 5 cycles per degree against your 60, so a face has to be roughly 12 times closer for it to pick out the detail you do. Your outline and your movement read clearly; your expression does not.
Colour comparison
How each colour shifts when seen through this animal's eyes, using the same colour model as the app. Tones a screen can't emit (such as ultraviolet) are shown as an approximation.
What colours can a cat see?
Muted, desaturated colour dominated by blues and yellows; poor red–green discrimination and generally little interest in colour.
Photoreceptors
Dichromat (2 cone types), heavily rod-dominated
Cone peak sensitivities
- S (blue)450 nm
- L (green-yellow)550 nm
How does a cat see in the dark?
Large cornea, slit pupil and strong tapetum: sees with roughly one-sixth of the light humans need.
How does a cat's vision compare to a human's?
In daylight a cat resolves about 20/120 against your 20/20, and its colours look muted next to yours. Come nightfall the ranking flips: it outsees you comfortably in near-darkness, over a 200-degree field that roughly matches your own.
What is special about a cat's vision?
- Outstanding low-light vision
- Excellent motion detection
- Blurry up close (<25 cm)
What the research shows
Cats are hard to test for colour: they lean on brightness, so an experiment must rule out brightness cues before a correct choice counts. Loop, Bruce & Petuchowski (1979) examined how the result shifts with stimulus size, shape and viewing distance, and a weak third mechanism near 500 nm has been reported, though it remains contested. The conservative reading, and the one modeled here, is a dichromat with a short-wave cone near 450 nm, consistent with Guenther & Zrenner (1993). Acuity comes from behavioural resolution tests, Blake, Cool & Crawford (1974) among them, and spans roughly 4–9 cpd, often quoted as 20/100 to 20/150; the site uses 5 cpd, which is 20/120 on the clinical scale.
Those behavioural figures sit well below what the cat's optics could in principle deliver, around 20/30, and the research notes prefer behaviour because it better reflects the detail a cat actually uses. Flicker is similarly method-dependent: about 55 Hz in older photopic measurements, while retinal cells follow flicker up to roughly 70–80 Hz in bright light. The night advantage is anatomical, with peak rod density near 460,000 per square millimeter, about three times the human value, and a threshold estimated at one-sixth to one-eighth of the light people need. Brightening an image changes how it looks to a human eye; it cannot give that eye the cat's extra rods.
Guides: Dog vs cat vision, compared · Are animals colour blind? · Which animal has the best eyesight? · All guides
Scientific sources
- Guenther & Zrenner (1993)
- Loop, Bruce & Petuchowski (1979)
- Clark & Clark (2016)
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