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.
One of the most common causes of twitches in your right eye is tiredness and stress. Usually, getting enough rest and relaxing is enough to stop your right or left eye twitching and jumping. However, there are other reasons for your eyelid to blink repeatedly.