Earthworms do not have eyes, they do have cells that are sensitive to light distributed through their outer skin. These don't let earthworms see images, but it does allow their skin to detect light and changes in light intensity.
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Yes, they blink sideways. It's freaky.
Yes reptiles can blink
Because they don't blink
Yes
Never, snakes have occular scales that cover their eyes indefinitely instead of eyelids that they can blink either voluntarily or involutarily.