Sheep, goats, octopuses and toads have rectangular shaped pupils. These animals need to have a defense both day and night, but they don’t have vertical slits like cats since they need to survey their surroundings more accurately. – WTF Fun Facts
Source: https://www.science20.com/variety_tap/evolution_rectangular_eye
The four-eyed fish (Anableps) have eyes raised on top of their head which are divided into two sets of pupils and corneas to see both above and below the waterline. They also mate only on one side, right-“handed” males mate only with left-“handed” females and vice versa. – WTF Fun Facts
The pupils of human eyes are at their largest as an adolescent and then slowly shrink until about the age of 60.