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The Nictitating Membrane at 7 Weeks
Raptors, meat-eating birds, are very dependent on acute eyesight for hunting. The nictitating membrane now appears much clearer, enabling the bird to see through it more distinctly in times of struggle. Eyes are finely crafted for the hunt. A rather flattened lens placed further from the retina produces a longer focal length that creates a larger, more telescopic image. A curved cornea and large pupils admit lots of light to further enhance imaging. Raptors are said to have eyesight which is sharp at three times the distance of the human eye.
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