choroidal thickness myopia axial length young adults the Raine Study
PURPOSE. The purpose of this study was to explore the age-related change in choroidal thickness (ChT) and test the hypothesis that baseline ChT is predictive of refractive error change in healthy young adults.
METHODS. Participants underwent spectral-domain optical coherence tomography (SD-OCT) imaging and autorefraction at 20 (baseline) and 28 years old. The enhanced depth imaging mode on the SD-OCT was used to obtain images of the choroid. Scans were exported from the SD-OCT and analyzed with a custom software that automatically measures the central ChT. The longitudinal change in subfoveal ChT and association between baseline subfoveal ChT and 8-year change in refractive error (spherical equiva-lent) were determined using linear mixed models.
RESULTS. In total, 395 eyes of 198 participants (44% men; 18-22 years at baseline) were included. Over 8 years, mean spherical equivalent decreased by 0.25 diopters (D) and axial length increased by 0.09 mm. Subfoveal choroid thickened by 1.3 pm/year (95% confidence interval [CI] = 0.6-2.0), but this was reduced by 0.9 pm/year (95% CI = 1.6- 0.2) for every 1 mm increase in axial length. For every 10 pm increase in baseline ChT, average annual change in spherical equivalent and axial length reduced by 0.006 D/year and 0.003 mm/year, respectively.
CONCLUSIONS. In a community-based cohort of young adults, the choroid continued to change during early adulthood. Choroidal thickening was less in eyes that were longer at baseline, and the choroid thinned in eyes that showed myopia progression. The asso-ciation between baseline ChT and longitudinal changes in spherical equivalent and axial length supports the hypothesis that ChT may be predictive of refractive error develop-ment and/or myopia progression.
Details
Title
Choroidal Thickening During Young Adulthood and Baseline Choroidal Thickness Predicts Refractive Error Change
Authors
Samantha Sze-Yee Lee (Corresponding Author) - The University of Western Australia
David Alonso-Caneiro (Author) - Queensland University of Technology
Gareth Lingham (Author) - The University of Western Australia
Fred K. Chen (Author) - The University of Western Australia
Paul G. Sanfilippo (Author) - The University of Melbourne
Seyhan Yazar (Author) - Garvan Institute of Medical Research
David A. Mackey (Author) - The University of Western Australia