J Korean Ophthalmol Soc.  2012 May;53(5):626-631.

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

• Kim KH
• Kim DG

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 (> or =-6.0 D and <-6.0 D) and axial length (> or =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.

Keyword

Axial length; Choroidal thickness; Optical coherence tomography; Refractive power

MeSH Terms

Choroid
Eye
Myopia
Tokyo
Tomography, Optical Coherence

Figure

• 

  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.

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  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.

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  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).

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