Is High Myopia hereditary?

High Myopia is a complex condition that is both genetic and hereditary, often resulting from a combination of multiple genetic variants and environmental influences rather than a single gene mutation. While it is strongly influenced by family history, it is primarily considered a multifactorial trait, meaning that the risk for offspring depends on a complex interplay between inherited genetic susceptibility and lifestyle factors.

Is High Myopia considered a hereditary condition?

Yes, High Myopia is strongly hereditary. Clinical studies show that individuals with one parent affected by High Myopia have a significantly increased risk of developing the condition compared to those with no family history. When both parents are affected, the risk to their children increases substantially. While it is "genetic" in the sense that it is encoded in your DNA, it is "hereditary" because these susceptibility factors are passed down through generations, typically following a polygenic inheritance pattern rather than a simple Mendelian pattern (like purely autosomal dominant or recessive).

How does the inheritance of High Myopia work?

Most cases of High Myopia are multifactorial, meaning they arise from the cumulative effect of many small genetic variations interacting with environmental triggers, such as excessive near-work or limited outdoor time. However, there are rare forms of syndromic High Myopia that follow specific Mendelian patterns, such as autosomal dominant, autosomal recessive, or X-linked inheritance. In these rare cases, the myopia is often part of a larger clinical syndrome involving other systemic health issues.

Is genetic testing recommended for High Myopia?

Routine genetic testing is not typically performed for common, non-syndromic High Myopia because identifying the specific genetic cause is difficult given its polygenic nature. However, testing may be recommended in the following scenarios:

• When High Myopia is present alongside other physical or developmental symptoms, suggesting a syndromic form.


• In families where there is a very strong, early-onset pattern of extreme myopia that suggests a single gene mutation.


• When a family is seeking reproductive options and wants to understand the risk of passing on specific, identified pathogenic variants.

What is the role of genetic counseling?

For families impacted by High Myopia, genetic counseling provides a space to discuss recurrence risks and the difference between common myopia and rare, syndromic forms. A genetic counselor can help interpret family history, explain the likelihood of children developing the condition, and discuss the limitations of current genetic screening. While de novo (spontaneous) mutations are rare in common High Myopia, they can occur in specific syndromic cases, and a counselor can help determine if this is a possibility for your family.

Next steps

• Schedule a comprehensive dilated eye exam with an ophthalmologist or a low-vision specialist to monitor retinal health.


• Consult with a medical geneticist if your family history includes other systemic health conditions or if the myopia is extremely severe and early-onset.


• Join the High Myopia community at DiseaseMaps.org to connect with the 78 members who share similar experiences and management strategies.


• Maintain a record of your family’s ocular history to share with your healthcare providers during future consultations.

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

References

• National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD).


• Online Mendelian Inheritance in Man (OMIM) database regarding myopia susceptibility genes.


• Orphanet: Portal for rare diseases and orphan drugs.


• International Myopia Institute (IMI) clinical reports and white papers.