It is clearly the primary eye, the one that defines “forward” for them, and probably the most sophisticated eye. No doubt they are similar to Jumping Spiders, who also have eight eyes but use binocular vision with the two largest, while the other six are much more primitive and see far less detail, used mostly to watch for motion that might indicate larger predators sneaking up on them. Not exactly the same, the other eyes appear structurally similar to the main eye, but no doubt their acuity is less. Even if they are not, if their brains are wired that way then they will react that way.
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A Nil has eight eyes correct? Why is the main one so important and special?
It is clearly the primary eye, the one that defines “forward” for them, and probably the most sophisticated eye. No doubt they are similar to Jumping Spiders, who also have eight eyes but use binocular vision with the two largest, while the other six are much more primitive and see far less detail, used mostly to watch for motion that might indicate larger predators sneaking up on them. Not exactly the same, the other eyes appear structurally similar to the main eye, but no doubt their acuity is less. Even if they are not, if their brains are wired that way then they will react that way.
bonus content about nihallak anatomy might help
https://eldrikdgt.com/fvt/wp-content/uploads/nihallak-anatomy.jpg