J Korean Ophthalmol Soc.  2018 Mar;59(3):246-251. 10.3341/jkos.2018.59.3.246.

Change in Axial Length in Highly Myopic Adults Using Partial Coherence Interferometry

• Lee JJ
• Lee IH
• Ahn MW
• Pak KY
• Park SW
• Byon IS
• Lee JE

• KMID: 2406959
• DOI: http://doi.org/10.3341/jkos.2018.59.3.246

Abstract

PURPOSE
To investigate the change in axial length (AL) in highly myopic adults using partial coherence interferometry, and to identify the factors associated with the increase in AL.
METHODS
Medical records of highly myopic adults (≥−6 diopters [D] or AL ≥ 26.0 mm) were retrospectively reviewed. The AL of each patient was measured using partial coherence interferometry at least three times over 2 years, and the yearly change in AL was calculated. Associations between age, AL, choroidal thickness, and the rate of AL change were evaluated using multiple regression analysis.
RESULTS
In total, 24 patients (4 males, 20 females) and 44 eyes were included in this study. The mean age was 54.9 ± 10.4 years, the initial AL was 29.335 ± 2.006 mm, the choroidal thickness was 72.7 ± 41.80 µm, the average spherical equivalent was −11.86 ± 3.85 D (−5.1~−22.0 D), and the mean follow-up period was 2.2 ± 0.5 years. A significant increase in AL of ≥0.05 mm was observed in 38 eyes (86.4%) at 2 years. The mean AL was significantly increased, to 29.409 ± 2.007 mm (p < 0.001), at 1 year and to 29.476 ± 2.028 mm (p < 0.001) at 2 years. The average rate of AL change was 0.071 ± 0.049 mm (−0.01~0.19 mm) per year. None of the included factors showed an association with the rate of AL change in multiple regression analysis.
CONCLUSIONS
In this study, an increase in AL in highly myopic adults was more frequent than in previous reports using A-scan. Periodic measurements are therefore recommended for the early detection of complications.

Keyword

Axial length; High myopia; Partial coherence interferometry

MeSH Terms

Adult*
Choroid
Follow-Up Studies
Humans
Interferometry*
Male
Medical Records
Retrospective Studies

Figure

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  Figure 1. Changes of axial length measured with partial coherence interferometry in highly myopic eyes. (A) Axial length changes in the right eye. (B) Axial length changes in the left eye. Mean axial length was significantly increased in both eyes at the first and second year (p < 0.001, Wilcoxon signed rank test). The error bars indicate the quartile ranges.

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  Figure 2. Correlation of axial length changes between the first year and the second year. The amount of axial length change had a significant correlation between the first year and the second year (p < 0.001, r = 0.574).

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