1 Touch Response: The keys on a digital piano or keyboard can be weighted (similar to those of a traditional piano), touch sensitive (unweighted but still sound loud when struck hard), or neither.
In very rare instances, eyelid twitching can indicate a more serious condition, like the beginning stages of multiple sclerosis or a lesion on the brain stem. Those conditions typically begin with a host of symptoms, and in this circumstance the eyelid twitch soon moves to the facial muscles, as well.
Eyelid twitching is a symptom of either low-potassium or stress. That's interesting the potassium. I have been forgetting to take my multi-vitamin, so I'll see if that helps too. Eyelid twitching is a symptom of either low-potassium or stress. Listen in deep silence.