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In the wild, a cat may be both prey and predator, but a pet feline still has the same eye characteristics of a wild one. Cats have excellent peripheral vision and their protruding eyes give them a wider angle of vision than human eyes. Cats see clearly in only 1/6 the light we humans need and their pupils can be dialated wide enough so that they take up 90% of the eye area. The pupil may dialate whenever the cat becomes angry, excited, or frightened as the slit pupil becomes an elongated oval. In sunlight, the pupils close almost all the way, to protect the eye. Feline eyes have both rods and cones, with more rods for vision in dim light. A cat’s vision is best between six to 18 feet in front of it. A unique feature of cat vision is that the animal is able to see well in both day and night, as their pupil is able to change from an elongated oval slit to a round circle almost the same size as the cornea.

A common myth is that cats are color-blind. Through tests and trials, scientists have determined that cats are able to differentiate between green, blue, and yellow, but not red. Feline cone cells are sensitive to blue and green but not to red. Color in itself is not very meaningful to cats. The world from the feline view is seen in a soft focus; a cat cannot hone in on details because of the large lens, which functions to gather as much light as possible. Motion-detecting rod cells in the retina make cats’ eyes very attuned to motion, more than human eyes. Perhaps the most wonderful aspect of the cat’s eye is the tapetum lucidum, a layer of reflective cells found behind the retina. Through the bouncing of light off the tapetum lucidum and back to the retina, rods and cones have a better ability to receive information.
-—————http://static.sewanee.edu/chem/Chem&Art/Detail_Pages/ColorProjects_2003/Early/index.htm

Since he can see greens and blues he could be alarmed ... but he can’t see photoshop, so it’s OK.