Myopia: Differentiating Optic Nerve Changes

Are they caused by myopia or glaucoma, and when does the former cause the latter?

By: Maria Liu, OD, PHD, MPH, MBA, FAAO

Optometric Management March 3, 2025 Vol 60, No. 2, Issue March 2025

Clinical Scorecard: Myopia: Differentiating Optic Nerve Changes

Category	Detail
Condition	Myopia and glaucoma involve structural and functional optic nerve head changes with overlapping features.
Key Mechanisms	Excessive axial elongation in myopia causes optic nerve head changes that complicate differentiation from glaucoma, which involves progressive optic nerve damage due to increased intraocular pressure and biomechanical factors.
Target Population	Patients with high myopia and those at risk for glaucoma.
Care Setting	Ophthalmology and optometry clinical settings with access to advanced imaging technologies.

Axial elongation in high myopia leads to optic nerve head changes that mimic glaucomatous damage.
Myopia is a major risk factor for glaucoma due to structural susceptibility from axial elongation.
Advanced imaging such as OCT with myopia-specific normative databases improves differentiation between myopia-induced and glaucomatous changes.

Use optical coherence tomography (OCT) with myopia-specific normative databases for accurate assessment of retinal nerve fiber layer thickness.
Incorporate optical biometry to measure axial length routinely in glaucoma risk assessments for myopic patients.
Establish baseline retinal imaging early during axial elongation to differentiate myopia-related changes from glaucoma.

Monitor patients with high myopia closely for signs of glaucoma development due to increased risk.
Consider biomechanical factors such as lamina cribrosa stiffness in glaucoma management strategies.

Perform longitudinal imaging to track peripapillary and optic nerve head structural changes over time.
Regularly assess visual field defects while accounting for myopia-induced alterations.

High myopia significantly amplifies the risk of developing glaucoma.
Misinterpretation of optic nerve changes due to myopia can delay glaucoma diagnosis and treatment.

Individuals with high myopia undergoing glaucoma risk assessment.

Incorporating axial length measurements and myopia-specific imaging data enhances specificity in glaucoma screening and guides timely intervention.

Utilize myopia-specific normative databases in OCT imaging to improve diagnostic accuracy.
Incorporate axial length measurement via optical biometry in routine glaucoma evaluations for myopic patients.
Establish early baseline retinal imaging to monitor progression and differentiate myopia-induced changes from glaucomatous damage.