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And sabre-tooth tigers aren't tigers. But as an ambush predadator, smilodon probably had slit eyes.

_{Let me point out that cats' pupils are circular in limited light. And while dogs may not have slit pupils, foxes do. But this turns out to be a fascinating and poorly researched rabbit hole. And according to the goto paper, the large cats evolved circular pupils from an ancestor with slit pupils. It's not clear whether smilodon would have had slit pupils or whether it's lifestyle fulfilled the conditions to evolve them - it's eyes weren't as forward facing as modern cats. But it's certainly possible.}