Abstract
PurposeTo measure the optic disc rotation around the vertical and horizontal disc axis and to evaluate associations with general and ocular parameters.DesignPopulation-based studyMethodsIn the Beijing Eye Study, 3468 participants (mean age:64.6±9.8 years; range:50–93 years) underwent an ophthalmological examination which included spectral-domain optical coherence tomography (OCT) with enhanced depth imaging. Using the OCT images, we determined the amount of the rotation of the optic disc (defined as Bruch´s membrane opening (BMO)) around the vertical axis and horizontal axis.ResultsOptic disc rotation measurements were available for 3037 (87.6%) individuals. In multivariate analysis, larger optic disc rotation around the vertical axis (range:-4.90° to 41.0°) was associated (regression coefficient r:0.27) with high axial myopia (axial length ≥26.5 mm) (P<0.001;standardized regression coefficient beta beta:0.09), longer disc-fovea distance (P = 0.001;beta:0.09) and wider parapapillary beta/gamma zone (P<0.001;beta0.12). Larger optic disc rotation around the horizontal axis (range:-7.10° to 26.4°) was associated (r:0.32) with high axial myopia (P = 0.001;beta:0.08), larger optic disc-fovea angle (P<0.001;beta:0.13), thinner superior nasal retinal nerve fiber layer (RNFL) thickness (P<0.001;beta:-0.19) and thicker inferior nasal RNFL thickness (P<0.001;beta:0.17).ConclusionsVertical optic disc rotation was associated with highly myopic axial elongation, increased disc-fovea distance and development or enlargement of parapapillary, Bruch´s membrane free, gamma zone, while macular Bruch´s membrane length is not affected. Horizontal optic disc rotation was associated with inferior dislocation of the fovea, in addition to a thinner superior nasal RNFL and thicker inferior nasal RNFL. The latter association may be taken into account in the interpretation of RNFL thickness profiles.
Highlights
The morphology of the optic disc is characterized by the size and shape optic nerve head [1]
Vertical optic disc rotation was associated with highly myopic axial elongation, increased disc-fovea distance and development or enlargement of parapapillary, Bruchs membrane free, gamma zone, while macular Bruchs membrane length is not affected
Horizontal optic disc rotation was associated with inferior dislocation of the fovea, in addition to a thinner superior nasal retinal nerve fiber layer (RNFL) and thicker inferior nasal RNFL
Summary
In the Beijing Eye Study, 3468 participants (mean age:64.6±9.8 years; range: years) underwent an ophthalmological examination which included spectral-domain optical coherence tomography (OCT) with enhanced depth imaging. Using the OCT images, we determined the amount of the rotation of the optic disc (defined as Bruchs membrane opening (BMO)) around the vertical axis and horizontal axis. Data Availability Statement: All relevant data are within the paper. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript
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