Журнал клинической и экспериментальной офтальмологии
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Choroidal Thickness Profile in Healthy Eyes of Adult Omani Population: A Cross-Sectional, Descriptive Clinical Study

Mohamed Al-Abri, Amal Al-Aliyani, Washoo Mal, Abin Holla, Athila Al-Rawahi, Malyar Al-Marhoon, Noor Al-Jabri, Ahmed Al-Hinai, Nawal Al-Fadhil, Hanan Al-Harthy

Objective: To determine the Choroidal Thickness (CT) profile in healthy eyes of adult Omani population.

Methods: A cross-sectional study involving three hundred eyes of 150 volunteers (75 males, 75 females) ≥ 18 years of age. Volunteer’s age, gender, visual acuity, refractive error, and Axial Length (AL) were recorded. CT was measured at sub-foveal area and 500 microns and 1000 microns temporal, nasal, superior, and inferior from the fovea using Enhanced Depth Imaging-Optical Coherence Tomography (EDI-OCT) device.

Results: The mean age was 33.3 years (range: 21-55 years, SD ± 9.2 years), and the mean AL was 23.76 mm (SD ± 0.94 mm). CT was found thickest at the sub-foveal area (330.88 µm (SD ± 69.52 µm; 95% CI)). The second highest CT was found superiorly 500 µm away from the fovea (324.48 µm (SD ± 70.24 µm; 95% CI)). The lowest CT was 1000 µm away from the fovea nasally (301.16 µm (SD ± 70 µm; 95% CI)). A strong negative correlation was found between CT and age (p-value<0.05). There was no significant statistical difference in sub-foveal CT between males (337.61 µm, SD ± 75.64) and females (324.24 µm, SD ± 62.7) (P=0.242). No significant relationship was found between CT and AL or refractive errors.

Conclusion: Our study provides normative database of CT in healthy eyes of adult Omani population. CT depends on its location, sub-foveal being the thickest and nasally the thinnest. Establishing normative data of CT serves as a reference in the clinical settings and future researches.