Understanding the pathologic myopia globe shape is essential for predicting structural and functional decline in high-risk patients. Recently, a 15-year prospective cohort study published in JAMA Ophthalmology explored how three-dimensional (3D) eye subtypes influence long-term outcomes. By utilizing high-resolution magnetic resonance imaging (MRI), researchers identified specific globe morphologies that correlate with axial elongation and vision loss. Consequently, this study offers a new framework for early intervention and personalized patient management.

Classifying 3D Eye Subtypes in High Myopia

The research team analyzed a subsample from the Zhongshan High Myopia Cohort. They classified eye shapes into six distinct categories: spheroidal, ellipsoidal, conical, nasally distorted, temporally distorted, and barrel-shaped. Clinicians generally define spheroidal and ellipsoidal types as nondeformed. In contrast, they consider the other four shapes as deformed. Furthermore, the baseline assessment revealed that deformed eye shapes significantly increase the risk of progressive structural changes. Therefore, identifying these shapes early may help prioritize patients for more intensive monitoring.

Clinical Significance of Pathologic Myopia Globe Shape

The study measured primary outcomes including annual axial elongation rates and macular choroidal thinning. Findings showed that deformed eyes experienced rapid elongation at a rate of ≥0.10 mm/y. Specifically, the conical and distorted subtypes demonstrated the highest risk for macular atrophy and visual impairment. Additionally, the researchers noted that 3D MRI assessments provide superior detail compared to traditional fundus photography. Consequently, these morphological insights help clinicians understand why certain eyes progress faster than others despite similar refractive errors.

Prognostic Implications for Long-Term Vision

Over the 15-year follow-up period, structural changes directly impacted functional vision. Deformed eye shapes were associated with a higher incidence of myopic maculopathy. Moreover, the risk of uncorrectable vision loss rose significantly in patients with temporally distorted or barrel-shaped globes. Because these shapes influence scleral tension, they likely contribute to accelerated chorioretinal degeneration. Overall, integrating 3D globe shape analysis into clinical practice could revolutionize the way we manage high myopia globally.

Frequently Asked Questions

How does globe shape affect axial elongation?

A deformed globe shape creates uneven tension on the sclera and retina. This mechanical stress promotes faster axial elongation and thinning of the choroidal layer, leading to more severe myopic complications over time.

Which eye shape subtypes are considered deformed?

The study identifies conical, nasally distorted, temporally distorted, and barrel-shaped globes as deformed types. These subtypes carry a significantly higher risk for vision loss compared to spheroidal or ellipsoidal shapes.

Why is 3D MRI used for these assessments?

High-resolution MRI allows for a complete three-dimensional visualization of the entire eyeball. Unlike traditional imaging, it accurately captures staphylomas and posterior protrusions that are often missed during standard fundus examinations.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or a professional relationship. Refer to the latest local and national guidelines for clinical practice.

References

1. Xiong R et al. Pathologic Myopia Globe Shape and Long-Term Prognosis. JAMA Ophthalmol. 2026 May 28. doi: 10.1001/jamaophthalmol.2026.1561. PMID: 42207540.


2. Ohno-Matsui K. Pathologic Myopia. Annals of the Eye. 2018;2:8. doi:10.21037/ae.2018.02.01.


3. Tideman JWL, et al. Association of Axial Length With Risk of Uncorrectable Visual Impairment for Europeans With Myopia. JAMA Ophthalmol. 2016;134(12):1355-1363.