Relationship between ocular dominance and interocular biometric parameters using swept-source optical coherence tomography (SS-OCT): Relación entre la dominancia ocular y los parámetros biométricos interoculares mediante tomografía de coherencia óptica de fuente barrida (SS-OCT).

PURPOSE: To investigate whether ocular dominance is associated with measurable differences in interocular biometric parameters using swept-source optical coherence tomography (SS-OCT).

MATERIALS AND

METHODS

This cross-sectional observational study included 227 phakic adults who underwent SS-OCT biometry (IOLMaster 700, Carl Zeiss Meditec). Dominant and non-dominant eyes were identified using the hole-in-the-card test. Axial length (AL), anterior chamber depth (ACD), crystalline lens thickness (LT), keratometry in flat (K1) and steep (K2) meridians, white-to-white (WTW) distance, and Chang-Waring chord distance (CWC-D) and angle (CWC-A) were compared as paired data. Statistical analyses included paired-sample t-test or Wilcoxon signed-rank test for group comparisons, and Spearman correlation for associations between biometric variables. A p-value <0.05 was considered significant.

RESULTS

Among 227 participants (mean age 48.7 ± 16.2 years), 68.2% demonstrated right-eye dominance. No statistically significant interocular differences were observed in AL, ACD, LT, K1, K2, WTW, or chord μ (all p > 0.05). Correlation analysis showed that chord μ was negatively correlated with AL, ACD, and WTW, and positively correlated with LT and spherical equivalent in both eyes.

CONCLUSIONS

In subjects with low anisometropia (<2 D) and comparable visual acuity between eyes, ocular dominance was not associated with biometric asymmetry measured by SS-OCT. These findings suggest that ocular dominance represents a primarily functional rather than anatomical preference.