My son can vibrate his pupils

He can vibrate his pupils without shaking his head. He is 8 years old. He thinks it's funny. And to me this is bizzare.
Is this normal?

Does anyone know?

Thanks
B

[Ray T Oyakawa, MD]

I don't know what you mean by vibrate his pupils.

Dr. O.

[Bud123]

Thanks.

When I look in to his eyes, I can see his pupils shake very fast (like vibrating), when he does it.

It doesnt happen always...It's something that he can do when he wants....
Is this clear? Please let me know.
Thanks
Bud123

[DaniGarate]

I can do this with my eyes too! So can my sister and my best friend. My friend and I are researching it for our science fair, If we find anything, I'll get back to you :)

[desirepistole]

Hello, your son is perfectly normal.  I too can vibrate my eyes, when you see his pupils moving he is acutally twitching the eyeball.  The muscles we use to look one way or another are voluntary, but most people don't actively think about it. Some people, like your son, can access those musles to make them respond in a very quick and controlled manner.  It is called nyastamus, usually involuntary, but for some voluntary.  So no worries, the worst outcome of this habit is tired eyes just like after long reading which goes away shortly.  Hope these helps :)