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eye or eyes?

we say"to catch my eye" but we also say "my eyes are riveted to…'"so when to use the pl and when the original form

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Normally, as you would obviously expect, we use "eye" when we mean one eye, and "eyes" when we mean more than one. "catch my eye" is an idiomatic expression. The use of singular "eye" is not readily predictable. Singular "eye" is also used in a fairly unpredictable way in certain other idiomatic expressions such as "keep an eye on".