Catch somebody’s eye
Definition 1 of 1
Pro Tip 1/3Visual Attraction
Often used when something visually stands out and grabs your attention unexpectedly. 
The vibrant street art quickly caught my eye.
Pro Tip 2/3Subtle Interest
Can imply a mild or fleeting interest, not necessarily a strong or lasting one. 
Among the antiques, a small vase caught my eye.
Pro Tip 3/3Not Literal
It's a figurative expression and doesn't involve actual eye contact or physical catching. 
The book title caught my eye as I walked past the store.