"You have a good eye for people"

Why does this sentence use "a good eye" and not " good eyes"? (Even though we have 2 eyes)

Question

"You have a good eye for people"

Why does this sentence use "a good eye" and not " good eyes"? (Even though we have 2 eyes)

Answer

Hi Mae!

Good Eye can be interpreted in many ways. Firstly, it can be used in archery were you see the target with one eye. 
However, it can also be a complement - say you point out something in the distance, your friend could say to you - "Good Eye!" You saw something far away.

Also if say your friend has a new belt (or other clothing item) and you notice it and point it out. They could say "Good Eye" too.

Hope this helps you! Have a great weekend :) - Brad

Answer

To have an eye for something - to have an ability to notice something.
For example: 
She has a good eye for detail.

Answer

Hi Mae,

It is a image taken from archery where you sight the target using one eye.

Best wishes,

Richard

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