Why do beluga whales have tiny eyes?

Answer 1

So its eyes are more protected as there is less to harm Also, it doesn't need to have big eyes and has therefore adapted to that as it doesn't need to watch out for predators or look out for prey that easily

Answer 2

Dolphins have small eyes because their body is large.

Their eyes just seem small because of their body size.

Also probably because they use echolocation just like bats.