Cat's-eye pupil, also known as a vertical slit pupil, is a unique eye feature found in some animals that helps them see better in low light conditions. However, if you want to refer to this peculiar feature using different terms, you can use words like "reptilian eye," "lizard eye," or "snake eye." Another option is to describe it as a "narrow pupil," "vertical pupil," or "slit pupil." You can also refer to it as an "elongated pupil," "eye slit," or "ocellus," which is a type of simple eye found in some animals. Regardless of the term used, the cat's-eye pupil remains a captivating feature that sets some animals apart.