My eye is blinking fast.what is the cause? sugar level is normal

Ocular irritation: Likely causes of twitching of the eyelid (eyelid myokymia )are related to ocular surface irritation, whether its from dry eyes, eyelid inflammation, allergies, dust, wind, medications, or stress. First trial artificial tears 4-6 times per day. Warm compresses and lid massages may also help. See an eye md if these don't help. An alternative problem is blepharospasm, which is slower, winking.