In this close-up you can see that there is something covering the eyes! It is called a nictitating membrane.
A nictitating membrane acts much like a pair of “goggles” for
raptors. In flight, raptors can see
through this third eyelid, and it will keep the eye safe from dust and other
objects in the air. It also keeps the
eye moist.
This is the same bird, in a subsequent frame.
You can see that the eye is uncovered for a moment in the bird's flight, and that there is nothing wrong with the eyes.
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