How do I know if I have High Myopia?

High myopia is clinically defined as a refractive error of -6.00 diopters or worse, or an axial length of the eye greater than 26.5 millimeters. You can identify potential high myopia by noting a significant dependency on corrective lenses for distance vision, frequent prescription increases, and the presence of associated ocular risks that require specialized monitoring by an ophthalmologist.

What are the early signs and symptoms of high myopia?

Unlike common nearsightedness that stabilizes in early adulthood, high myopia often involves progressive changes in the shape and health of the eye. Early indicators often include a history of rapidly worsening vision during childhood or adolescence, resulting in very thick spectacle lenses. Because high myopia involves an elongated eyeball, the structures inside the eye—such as the retina and choroid—are stretched thin, which may lead to symptoms beyond just blurry distance vision, such as increased light sensitivity or difficulty adjusting to low-light environments.

How can I self-assess for high myopia?

If you are concerned, look for these patterns in your medical history and daily life. While only a clinical exam can confirm the diagnosis, you may be experiencing high myopia if you recognize the following:

• Prescription trends: Your corrective lens prescription has consistently increased beyond -6.00 diopters.


• Family history: Close biological relatives (parents or siblings) also require very strong corrective lenses.


• Visual fatigue: Frequent eye strain or headaches, even when wearing your current glasses.


• Physical changes: Noticing "floaters" (small spots or cobwebs in your vision) or flashes of light, which are more common in eyes with high myopia due to vitreous changes.

When should I talk to my doctor and what tests should I request?

If you suspect you have high myopia, schedule an appointment with a comprehensive ophthalmologist rather than a standard retail optometrist. When you see your doctor, be specific: "I am concerned about the severity of my nearsightedness and the potential risks to my retinal health." Ask for a dilated fundus examination to inspect the peripheral retina. Specific tests to request include:

1. Axial Length Measurement: An A-scan or IOLMaster to measure the physical length of the eye.


2. Dilated Retinal Exam: Essential for identifying "myopic maculopathy" or thinning of the retina.


3. Optical Coherence Tomography (OCT): A scan that provides high-resolution images of the retinal layers.

What are the red flags requiring urgent care?

While high myopia is a chronic condition, certain symptoms indicate a medical emergency. Seek immediate care if you experience a sudden onset of "curtain-like" shadows in your visual field, a dramatic increase in the number of floaters, or sudden flashes of light. These can be signs of retinal detachment, a complication that occurs at a higher frequency in patients with high myopia.

How do I advocate for my eye health?

If your concerns are dismissed, remember that you are the expert on your own vision. If your doctor does not perform a dilated exam or explain the risks associated with your level of myopia, seek a second opinion from a retina specialist. Our DiseaseMaps.org community, which includes 78 people living with this condition, emphasizes the importance of proactive, specialized care. Do not settle for a simple vision check; ensure your entire ocular structure is being monitored.

Next steps

• Schedule a comprehensive dilated eye exam with a board-certified ophthalmologist.


• Document your past prescription history to track the rate of your vision change.


• Join the DiseaseMaps.org community to connect with others who understand the daily challenges of high myopia.


• Educate yourself on the signs of retinal detachment to ensure you know when to seek emergency care.

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment; always seek the guidance of your physician regarding any medical condition.

References

• National Eye Institute (NEI) - Facts About Myopia.


• Orphanet - Reference portal for rare diseases and high-myopia-related syndromes.


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


• International Myopia Institute (IMI) - Clinical guidelines and research reports.