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Kim and Kim: The Relationship among Refractive Power, Axial Length and Choroidal Thickness Measured by SD-OCT in Myopia
Original Article
Journal of the Korean Ophthalmological Society

Journal of the Korean Ophthalmological Society 2012; 53(5): 626-631.

Published online: 16 May 2012

DOI: https://doi.org/10.3341/jkos.2012.53.5.626

The Relationship among Refractive Power, Axial Length and Choroidal Thickness Measured by SD-OCT in Myopia

Keun Ho Kim, MD, Do Gyun Kim, MD, PhD

Department of Ophthalmology, Myongji Hospital, Kwandong University College of Medicine, Goyang, Korea.

Address reprint requests to Do Gyun Kim, MD, PhD. Department of Ophthalmology, Kwandong University College of Medicine Myongji Hospital, #55 Hwasu-ro 14beon-gil, Deogyang-gu, Goyang 412-826, Korea. Tel: 82-31-810-6250, Fax: 82-31-969-0500, kimdk89@empas.com

Received 14 October 2011       Accepted 2 April 2012

Copyright © 2012 The Korean Ophthalmological Society

Abstract

Purpose

To measure choroidal thickness in healthy myopic eyes and to evaluate the relationship among choroidal thickness and refractive power and axial length.

Methods

Eighty healthy myopic eyes were evaluated in the present study. The refractive power was measured using an automatic refractor and the axial length using A-scan. The subjects were divided into two groups based on refractive power (≥-6.0 D and <-6.0 D) and axial length (≥25 mm and <25 mm). The choroidal thickness was measured using spectral domain (SD) optical coherence tomography (3-dimensional [3D] OCT-2000, Software Version 6.01; Topcon Corp., Tokyo, Japan), and the statistical relationship between the two groups was analyzed.

Results

A statistically significant difference was found in choroidal thickness according to refractive power and axial length between the two groups (p < 0.001 and p < 0.05, respectively).

Conclusions

Refractive power and axial length had a significant relation to choroidal thickness measured by OCT. When excluding eyes with pathologic myopia, high myopia in healthy eyes may cause choroidal thinning.

Keywords: Axial length, Choroidal thickness, Optical coherence tomography, Refractive power

Figures and Tables

Figure 1
Scatter plots and regression line of the choroidal thickness against refractive power. p < 0.001; y = 14.19 ± 382.11; R2 = 0.266.
jkos-53-626-g001
Figure 2
Scatter plots and regression line of the choroidal thickness against axial length. p < 0.001; y = -27.87 ± 1025.61; R2 = 0.197.
jkos-53-626-g002
Figure 3
Comparison between OCT scanning in two eyes of different refractive powers and axial length. A 32-year-old man (refractive power -8.25 D, axial length 27.57 mm) with a subfoveal choroidal thickness of 227 µm (A) and a 33-year-old man (refractive power -2.875D, axial length 24.89 mm) with subfoveal choroidal thickness of 333 µm (B).
jkos-53-626-g003
Table 1
Demographics of patients in the study
jkos-53-626-i001

Values are presented as n or mean ± SD (range).

Table 2
Comparison of choroidal thickness according to refractive power
jkos-53-626-i002

Values are presented as mean ± SD.

D = dioper.

*Independent t-test between refractive power <6.00 D and refractive power ≥-6.00 D.

Table 3
Comparison of choroidal thickness according to axial length
jkos-53-626-i003

Values are presented as mean ± SD.

D = dioper.

*Independent t-test between axial length ≥25 mm and axial length <25 mm.

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