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Association between axial length and horizontal and vertical globe diameters
Jost B Jonas1, Kyoko Ohno-Matsui2, Leonard Holbach3
1Department of Ophthalmology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany. Jost.Jonas@medma.uni-heidelberg.de.
Summary
Globe dimensions were analyzed in relation to axial length. Beyond 24mm, axial length increases lead to sagittal elongation, changing the globe shape from spherical to elongated.
Area of Science:
- Ophthalmology
- Anatomy
- Biometry
Background:
- Understanding ocular dimensions is crucial for diagnosing and managing various eye conditions.
- Axial length, horizontal diameter, and vertical diameter are key biometric parameters of the human eye.
Purpose of the Study:
- To investigate the relationship between axial length and the horizontal and vertical globe diameters.
- To determine how ocular dimensions change with increasing axial length.
Main Methods:
- Analysis of enucleated human eyes (n=135).
- Measurement of horizontal, vertical, and sagittal globe diameters.
- Statistical correlation and regression analyses were performed.
Main Results:
- Horizontal and vertical globe diameters were similar and significantly shorter than axial diameter.
- Axial length showed a significant linear correlation with both horizontal and vertical diameters.
- Globe enlargement beyond 24mm axial length was predominantly in the sagittal axis, indicating a shift from a spherical to an elongated form.
Conclusions:
- Myopic globe enlargement beyond 24mm axial length occurs primarily in the sagittal axis.
- This suggests that myopic elongation may result from the stretching of eye walls near the globe's equator.
- The findings contribute to understanding the biomechanics of ocular growth and myopic progression.
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