Definition:An Aberration is a distortion of an image of an object that is caused when rays of light dont exactly obey the laws describing perfect optical systems
Main Aberrations can be described as
1 Spherical aberration
2 Chromatic Aberration
3 Oblique Aberration
4 Coma
5 High order Aberration
Correction of spherical Aberration in order to enhance vision quality
Correction of High order Aberration has been prime importance in Corneal refractive surgery
Spherical Aberration
Caused by the shape of the refractive surface and magnified effects
eyes with a dilated pupil is a significant problem
- Positive Spherical Aberrations
Light rays entering the eye near the pupil edge are focused in front of the retina
- Negative Spherical aberration
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