Expressive eyes

Do eyes 'shake' natrualy when happy? Im asking this because i'm wondering if it's a 'thing' amoung normal, healthy visoned people? I could be wrong because my eyes shake often due to an eye condition in addition to my various visual issues.

Anyways, i'm trying to discribe my visualy impaired teenager's eyes while happy/excited? Any other ways to discribe happyness/excitment then 'her eyes glisened/smiled'?

As a whole, in my story, eyes are very expressive.

I don't think eyes shake when people are excited... but there might be some technical sciency thing that I don't know about. Sometimes if a person is particularly excited about what they see their eyes might move about a lot as they're looking at a lot of different things.

Usually when people get excited their pupils dilate, their eyes get wider, and can seem watery or glassy. You could also use 'warm' or 'bright' as adjectives, or 'brighten,' 'glaze,' 'flutter,' or 'dance,' as verbs.