Octopuses have highly complex eyes that compare to human visual acuity. Focusing is done by moving the lens in and out, rather than by changing its shape as the human eye does. A unique characteristic of the octopus eye is its rotational ability and its consistent orientation in relation to gravity. Using their statocyst, (a balance organ common to many invertebrates), octopus always maintain their slit-shaped pupils in a horizontal position. Hence, their brains can always safely interpret visual information on the basis that the eyes are horizontally aligned, though the body may be at any angle in the three-dimensional water column.
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