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Seeing requires your eyes to sense. It also requires the brain to process the visual optical signals received by the eye sensors and create a feeling inside the brain. Seeing is a feeling in the brain. Thus, animal vision is a perception of creating a scene, an object, color, etc.
Animals with vision disabilities at birth may have different perceptions of the world inside their brains.
Don't you encounter that you can have a visual percept of this beautiful world, its people, scenes, objects even with your eyes closed? There remain huge visual percepts inside the brain memory. It is the job of brain memory callback.
Animal vision is accomplished by the brain in conjunction with the eyes. Thus, seeing is sensing plus processing of the sensed visual signals in the brain.
The eyes are a part of the brain. After sensing an optical signal from the external world, the eyes carry out some preprocessing before sending it to the brain for the more complex visual signal processing task.
The received preprocessed visual signal then undergoes complex signal processing inside the brain. The brain infers and registers the processed visual signal as different visual percepts.
Thus, animal vision is purely a perceptive phenomenon. It is called "visual perception," Animals without vision or having defective vision at birth may have no visual percepts or defective visual percepts.
Most animals have eyes to see the world. Animals don't have eye sensors with the same wavelength sensitivity. What does that mean?
Human eyes have sensors to sense the visible wavelength band.
What human eye sensors can sense may not be sensed by the birds' eyes. There are questions about why do animals respond differently to different wavelengths.
Reptiles can't see the visible wavelengths but they can see in the infrared band.
Mantis shrimp is probably the only animal that can customize its eye sensing capability! Mantis shrimp can see in both visible and invisible wavelength bands. In fact, mantis shrimp can dynamically customize their eye sensitivity.
If human eyes had only monochromatic (say black-and-white) vision, the entire world would have been like black-and-white cinema.
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