Eyelid twitching, what is it and why does it occur?

Our eyelids can sometimes suffer involuntary spasmodic contractions in the orbicularis oculi muscle. This twitching of the eyelids that people sometimes experience is a phenomenon known as blepharospasm. It may present itself in the form of uncontrollable blinking, forced eye closure and even, in severe cases, loss of vision. Why does this happen? Blepharospasm is [...]