geometric distortion

Definition: Apparent change of shape of objects at edge of field of wide-angle lens: round objects appear elliptical, square objects become trapezoid. * Effect is usually caused by failure to view the image from the correct perspective: when so viewed, the distortion disappears. * May be referred to as a perspective distortion.
Illusions of geometry
Arguably, geometric distortion is not a true distortion at all since it is not caused by a defect in the image-projection. Rather it's caused by the psychometry of viewing from a geometrically improper position, so it is more accurately classed as an optical illusion.

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