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Slitted eyes allow a nocturnal creature to adapt to a change in light level quickly. It actually has no bearing on how well they see. How much the pupil can dilate, and whether they have a tapetum lucidum is what affects night vision. A cat at night, for example has the pupils dilated till they are round and glow from the tapetum lucidum. Permanently slitted eyes at night would reduce night vision.
I mean, they’re nocturnal, right? Slitted eyes and everything. They should need practically no light at all.