Whenever we see a close up of a zombie's face, their eyes always appear to be a milky white / brown colour, which would lead me to believe they are blind.
And, I'm assuming, they don't produce tears, so their eyes should be damaged beyond use anyway. But it seems as if they can see reasonably well, at least well enough to distinguish a person from something else.
They probably use sound and smell to track targets, but I've seen episodes where they are distracted by flares or fires, so they have to be able to see well enough to spot a fire in the distance.
This question : Does a Walker's senses diminish with time? addresses a zombie's senses and if they diminish over time. I would be more interested in older zombies, as their eyes should really be damaged beyond any use.
Is their eyesight ever addressed or explained in the show or in the comics?