[Higher-order aberrations in myopic and astigmatism eyes].
OBJECTIVE
To analyze the distribution of the higher order aberrations in the population of Chinese with myopia and astigmatism and determine whether the pupil size, degree of myopia and astigmatism affects the higher order aberrations.


METHODS
Using a Tscherning method, 147 myopic and astigmatism eyes were evaluated before LASIK. The root mean square (RMS) values of higher order aberrations for each subject with pupil diameters of 4.5, 5.0, 5.5, 6.0, 6.5 and 7.0 mm were calculated. The subjects were divided into following groups: high myopia (> -6.00 D) and low myopia (<or= -6.00 D); astigmatism group I (>or= 0.75 D) and astigmatism group II (< 0.75 D).


RESULTS
The root mean square (RMS) values was decreased from 3rd order to sixth order aberrations in the same eye. The individual difference was from 6.1-fold to 36.6-fold in same type of aberration. All types of aberrations, in particular spherical and coma aberration, was increased significantly with increasing pupil size. Secondary spherical aberration, spherical and secondary coma aberration were affected by myopia, but coma aberration; astigmatism only affected the coma aberration, but spherical aberration.


CONCLUSIONS
The aberrations were increased with the increasing of refractive error such as myopia and astigmatism. Spherical aberration is more common in high myopia, Coma aberrations is related with astigmatism.
Shenzhen Eye Hospital Affiliated to Jinan University, Shenzhen 518001, China. hjrs@szonline.net
Jian-rong
JR
Hu
Zong-hui
ZH
Yan
Chun-feng
CF
Liu
Li-na
LN
Huang
D000328:Adult; D015858:Anisometropia / Q000473:pathology / Q000503:physiopathology; D001251:Astigmatism / Q000473:pathology* / Q000503:physiopathology; D002681:China; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000473:pathology* / Q000503:physiopathology; D011680:Pupil / Q000502:physiology; D012029:Refraction, Ocular / Q000502:physiology