How is High Myopia diagnosed?

High myopia is typically diagnosed through a comprehensive dilated eye examination that measures the refractive error of the eye to be -6.00 diopters or worse, or an axial length of 26.5 millimeters or greater. This diagnosis is confirmed by an ophthalmologist or optometrist using specialized imaging to assess the structural health of the retina and optic nerve, which are at higher risk for sight-threatening complications.

How is High Myopia diagnosed in a clinical setting?

The diagnostic process for High Myopia begins with a detailed clinical history and a comprehensive eye exam. Because High Myopia is a refractive condition, the primary diagnostic tool is a refraction test to determine the exact degree of nearsightedness. However, a diagnosis of High Myopia goes beyond a simple glasses prescription; it requires a thorough investigation of the eye's anatomy to rule out underlying pathology.

What tests are used to evaluate High Myopia?

To ensure a complete assessment, specialists utilize several diagnostic modalities to monitor the structural integrity of the eye:

• Refraction Testing: Measuring the refractive error, typically finding values greater than -6.00 diopters.


• Axial Length Measurement (A-scan/Biometry): Using ultrasound or laser interferometry to measure the physical length of the eye, with 26.5 mm or greater often serving as the threshold for High Myopia.


• Dilated Fundus Examination: A physician uses drops to widen the pupil, allowing a direct view of the retina to check for thinning, lattice degeneration, or retinal tears.


• Optical Coherence Tomography (OCT): A non-invasive imaging scan that provides high-resolution, cross-sectional images of the retina and macula to identify early signs of myopic maculopathy.

Which specialists are involved in the diagnostic process?

While an optometrist often identifies the initial refractive error, a diagnosis of High Myopia should be managed by a comprehensive ophthalmologist or, more specifically, a retina specialist. Because High Myopia can be associated with underlying genetic syndromes (such as Stickler syndrome or Marfan syndrome), a clinical geneticist may be consulted if there are systemic symptoms or a strong family history of early-onset blindness. We recognize that the "diagnostic odyssey" for patients can be exhausting, especially when symptoms are dismissed as "just needing stronger glasses." Your experience of seeking clarity is valid, and persisting until you find a specialist who understands the structural risks of High Myopia is essential.

What conditions are considered in the differential diagnosis?

It is important to distinguish simple, benign nearsightedness from High Myopia that is secondary to other conditions. Physicians must differentiate it from:

• Pathologic Myopia: Where the eye structure shows degenerative changes, not just a refractive error.


• Connective Tissue Disorders: Conditions like Marfan syndrome or Stickler syndrome can present with high refractive errors as a secondary feature.


• Congenital Glaucoma: In children, rapid changes in vision can mimic myopia but require vastly different treatment.

Next steps

• Schedule a dilated eye exam with a retina specialist if your refractive error is -6.00 diopters or higher.


• Maintain a record of your axial length measurements over time to track the progression of your condition.


• Join the DiseaseMaps.org community to connect with 78 other individuals sharing their experiences with High Myopia.


• Ask your provider about the necessity of genetic counseling if your myopia was diagnosed in early childhood or is accompanied by systemic health issues.

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice; please consult a qualified healthcare professional for diagnosis and treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Myopia Information.


• Orphanet: Rare eye diseases and high myopia classification.


• OMIM (Online Mendelian Inheritance in Man): Myopia, Autosomal Dominant.


• International Myopia Institute: Clinical guidelines for the management of high myopia.