Spherical: the error introduced into far off axis beams by exactly spherical lenses (lenses should of hyperbolic shape)
Chromatic: Colored fringes, due to the differences in refraction of different wavelength light
Coma: distortion of off axis points
Astigmatism: Failure to focus point sources to a point image (Cause of shortsightedness in people)
Distortion: a square object is imaged with either concave (barrel)or convex (pincushion) lines.
Astronomy: Apparent displacement of a star due to the earth’s motion. Light appears from a point at an angle a = v/c in the direction of motion, where v is the velocity of the earth and c is the speed of light.
Also Known As: Distortion, Spherical Aberration, Astigmatism, Coma, Chromatic aberration
Common Misspellings: Abberation Aberation Abberration