ok so chameleons change the color by changing the refraction light to form desires color. So theocratically, if there are some kind of nerve that detect the color of light( possibly cones) and send the signal to the other side and the cells recreate the color input to reflect the same, it could be a very camouflaged animal an possibly invisible.

 

Having so many optical receptors would seem like doing things the hard way, adaptively speaking.  Prey usually do camouflage by having exteriors that are roughly matching their niche, e.g. Sonoran lizards that don't want to be seen by hawks circling above, so their top sides look like desert sand and rock.

but in a flat non-rocky and non-sandy area, they are weak. if there are there receptors and color changes, they can use them in any terrain and type of climate

so it is possible but non-existent