system
Given the following post, respond as if you're commenting on Reddit:
human
[Biology] Is there any advantage to having a slitted pupil over a round pupil?
gpt
Slitted pupil can create a wider opening, because it only has to move in two directions. A round pupil has to dilate in every direction at once, and that naturally runs into limitations of flexibility and muscle contraction. The wider openings of the slitted pupil allows more light to enter, assisting low light vision.

On the other hand, round pupils are much better for focusing and all around visual acuity. Oblong pupils whether they're vertical (cat) or horizontal (goat), introduce natural focal issues in various parts of the field of vision.