Benefits of or reasons why a species would have only one eye?

Traditionally, a Cyclops has one eye, as well as some other aliens in fiction.

My question is simple: Would there be any situations, Earth-like or otherwise, where a creature would benefit from having only one eye?

As far as I know, creatures with eyes on earth all have more than one.

This question is not a duplicate of Anatomically correct Cyclops as this question focuses on all kinds of creatures, not only primates. Also the other question needs an Earth-like environment, something this question specifically does not require. Answers to this question would not necessarily be applicable to the other.

posted about 8 years ago

Xandar The Zenon‭

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