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 twitch is one of the most common types of eyelid spasms. Eyelid twitch is caused by something we still donât know for sure. Slight spasm of the lower, or even both eyelids is common, and of no concern. Symptoms are twitching or spasm around the eyes, or facial spasms. These symptoms may not necessary mean that you have eyelid spasms.