J Korean Ophthalmol Soc.  2012 Nov;53(11):1559-1563.

Estimation of Corneal Spherical Aberration from Topography

Affiliations
  • 1Department of Ophthalmology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. joon@amc.seoul.kr

Abstract

PURPOSE
To formulate an equation to estimate corneal spherical aberration using Orbscan (Bausch & Lomb Surgical, Rochester, NY, USA) parameters.
METHODS
The study was carried out retrospectively. The participants were 76 eyes of 76 senile cataract patients with the mean age of 57.37 +/- 17.63 years. Both Orbscan and KR-1W (Topcon Corp, Tokyo, Japan) were taken as preoperative examinations. Correlation analysis between various parameters from Orbscan and corneal spherical aberrations for a 6 mm pupil by KR-1W was performed. And multivariable linear regression was performed with the significantly correlated Orbscan parameters from the correlation analysis.
RESULTS
The mean corneal spherical aberration from KR-1W system was 0.25 +/- 0.08 microm. As a result of the multivariable linear regression, we could generate following equations. If the Q-value was available, estimated corneal spherical aberration = 0.389 x Q-value + (0.022 x Axial power 3 mm) - 0.633 (R2 = 0.436). If the Q-value was not available, estimated corneal spherical aberration = 0.184 x (Mean power 5 mm - Mean power 3 mm) + (0.02 x Axial power 3 mm) - 0.563 (R2 = 0.429). By using the equations, 93.4-94.7% of subjects were in the error range of 0.10 microm.
CONCLUSIONS
Even when equipped with Orbscan only, an appropriate aspheric intraocular lens can be selected using the estimated corneal apherical aberration by the equations.

Keyword

Corneal spherical aberration; KR-1W; Orbscan

MeSH Terms

Cataract
Eye
Humans
Lenses, Intraocular
Linear Models
Pupil
Retrospective Studies
Tokyo

Figure

  • Figure 1 The scatter plot comparing the estimated corneal spherical aberrations with the corneal spherical aberrations measured by KR-1W.


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