Estimation of Corneal Spherical Aberration from Topography

Jong Hoon Park; Myoung Joon Kim; Jae Yong Kim; Hung Won Tchah

doi:10.3341/jkos.2012.53.11.1559

Journal List > J Korean Ophthalmol Soc > v.53(11) > 1009213

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Park, Kim, Kim, and Tchah: Estimation of Corneal Spherical Aberration from Topography

Original Article

Journal of the Korean Ophthalmological Society

Journal of the Korean Ophthalmological Society 2012; 53(11): 1559-1563.

Published online: 19 November 2012

DOI: https://doi.org/10.3341/jkos.2012.53.11.1559

Estimation of Corneal Spherical Aberration from Topography

Jong Hoon Park, MD, Myoung Joon Kim, MD, Jae Yong Kim, MD, Hung Won Tchah, MD

Department of Ophthalmology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.

Address reprint requests to Myoung Joon Kim, MD. Department of Ophthalmology, Asan Medical Center, #88 43-gil, Olympic-ro, Songpa-gu, Seoul 138-736, Korea. Tel: 82-2-3010-3680, Fax: 82-2-470-6440, joon@amc.seoul.kr

Received 13 April 2012 Accepted 8 October 2012

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 µm. 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 × Q-value + (0.022 × Axial power 3 mm) - 0.633 (R² = 0.436). If the Q-value was not available, estimated corneal spherical aberration = 0.184 × (Mean power 5 mm - Mean power 3 mm) + (0.02 × 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 µm.

Conclusions

Even when equipped with Orbscan only, an appropriate aspheric intraocular lens can be selected using the estimated corneal apherical aberration by the equations.

Keywords: Corneal spherical aberration, KR-1W, Orbscan

Figures and Tables

Figure 1

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

Table 1

Correlation analysis between corneal spherical aberration (from KR-1W) and topographic parameters (from Orbscan)

^*p-value < 0.05.

Table 2

Multivariable linear regression: Q-value included

CI = confidence interval.

Table 3

Multivariable linear regression: Q-value excluded

CI = confidence interval.

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