Relationship between Axial Length and Corneo-Scleral Topography: A Preliminary Study

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optometry

Background:

• Axial length is a key determinant of refractive error and ocular health.
• Anterior segment parameters and scleral geometry influence overall eye length.
• Predictive models for axial length can aid in understanding eye growth and development.

Purpose of the Study:

• To investigate the relationship between overall eye axial length and various anterior segment parameters.
• To explore the role of scleral geometry in determining eye length.
• To develop predictive models for axial length based on anterior segment measurements.

Main Methods:

• Prospective, non-randomized, single-center study involving 64 eyes from 32 participants (ages 12-52).
• Comprehensive eye examinations including Fourier-domain profilometry for corneo-scleral shape analysis.
• Correlation analysis and linear model development to predict axial length.

Main Results:

• A strong negative correlation was observed between axial length and temporal-nasal ocular sagittal height difference across different chord lengths.
• A stable linear model was established for the right eye to predict axial length using spherical equivalent, corneal diameter, high-order aberrations, and minimum sagittal height.
• A predictive model for the left eye was developed using spherical equivalent and mean corneal curvature, incorporating other parameters based on chord length.

Conclusions:

• Anterior segment parameters, including scleral geometry, are significantly correlated with eye axial length.
• Predictive models show potential for estimating axial length from readily measurable anterior segment features.
• Further research with larger cohorts is recommended to validate these findings and refine predictive models.