Do visual objects have karma?
Vedana and Sañña arise only if three conditions were present in he first place: sense organ/faculty, sense-stimuli and consciousness specific to that organ/faculty. These three conditions are what is known as 'contact'.

Kamma can be understood as intentional deeds and as the continuation of habitual intentions underlying thoughts, words and bodily actions.

As far as we know with our current understanding of physics, biology and psychology, in order for something to have intentions, that something must have the capacity to sense, to interact, to respond, to interpret, to learn, to modify its behavior according stimuli from the surroundings and from its inner world. According to what I've said, "visual objects" (if understood as entities belonging the outside, "objective" world) only would create kamma if they present the capacities above described.

I'm not sure if this answer your questions, but at least it may provide some lines for future thoughts.

Kind regards!