What does “When Irish (either) eyes (or) I’s are smiling.” mean? - Help.com

When an irish person is smiling, there eyes smile to…?

“When Irish Eyes are Smiling”
words and music Chauncey Olcott & George Graff, Jr.

There’s a tear in your eye, And I’m wondering why,
For it never should be there at all.
With such pow’r in your smile, Sure a stone you’d beguile,
So there’s never a teardrop should fall.
When your sweet lilting laughter’s Like some fairy song,
And your eyes twinkle bright as can be;
You should laugh all the while And all other times smile,
And now, smile a smile for me.

When Irish eyes are smiling,
Sure, ’tis like the morn in Spring.
In the lilt of Irish laughter
You can hear the angels sing.
When Irish hearts are happy,
All the world seems bright and gay.
And when Irish eyes are smiling,
Sure, they steal your heart away.

For your smile is a part Of the love in your heart,
And it makes even sunshine more bright.
Like the linnet’s sweet song, Crooning all the day long,
Comes your laughter and light.
For the springtime of life Is the sweetest of all
There is ne’er a real care or regret;
And while springtime is ours Throughout all of youth’s hours,
Let us smile each chance we get.

It’s a song about an Irish lover’s smile, and when a smile is genuine, it’s not just at your mouth but in your eyes as well.

really when ur happy u smile form ur eyes, they just light up somehow