Phrase: the dark eyeslits narrowing with greed till her eyes were green stones

[Haihao]

Hi,

I have come across another sentence I am not clear about:

[Yankee]

Hi Haihao

The pupils of the cat's eyes became extremely narrow vertical slits, so narrow that the pupils were barely visible, thus leaving only the green color of the cat's eyes visible.
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Amy
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ESL teacher, translator, and a native speaker of American English

[Haihao]

Hi Amy,

Nice to have your instruction again! "Narrow vertical slits" explained everything. Thank you!

Haihao