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Diurnal raptors (especially eagles and hawks) are commonly thought to have incredible visual acuity, up to 5 or 8 times higher than a typical human. However, I haven't been able to find any scientific evidence of such measurements, beyond popular science websites and unsourced Wikipedia articles. The actual scientific estimates I've seen (such as this, see the results referenced in part 9) indicate that their vision is not really overwhelmingly better than our own, with even exceptionally large raptors like the wedge-tailed eagle only having twice the visual acuity of an average human, and many small sized raptors like falcons having actually substantially poorer vision. I understand that eye size is important (even with their proportionately large eyes they're still not larger than ours, and that places a maximum limit on spatial resolution)

They also have lower achromatic contrast sensitivity than a human (although their ability to distinguish chromatic contrast is far higher).

So are there any actual bird species with 5 times better vision than a human or is it just a pop culture/folklore myth?

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