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An Aberration

  1. The act of wandering; deviation from truth, moral rectitude; abnormal; divergence from the straight, correct, proper, normal, or from the natural state. [Late 16th century.][3]
  2. (optics) The convergence to different foci, by a lens or mirror, of rays of light emanatingfrom one and the same point, or the deviation of such rays from a single focus; a defect in a focusing mechanism that prevents the intended focal point. [Mid 18th century.][3]
  3. (astronomy) A small periodical change of position in the stars and other heavenly bodies, due to the combined effect of the motion of light and the motion of the observer. [Mid 18th century.][3] Aberration (astronomy) - Wikipedia
  4. A partial alienation of reason. [Early 19thcentury.][3]
  5. A mental disorder, especially one of a minor or temporary character. [Early 19th century.][3]
  6. (zoology, botany) Atypical development or structure; deviation from the normal type; an aberrant organ. [Mid 19th century.][3]
  7. (medicine) A deviation of a tissue, organ or mental functions from what is considered to be within the normal range.

Astrophisics:

Are Imperfections which happens to image formed by optical systems.

Some of this aberrations can be reduced by using the central part. The less use of the edges of the lens the better the images something that a camera diaphragm is usefull to obtain, through blocking out the outer part of the lens. Types of aberration: