Is Myopia a Disease, a Condition or a Disorder?
Author: Jason Higginbotham
BSc (Hons) MCOptom Prof Cert Glau Prof Cert Med Ret Prof Cert LV FBDO MBCLA
Myopia is a disease – if you can only pick one option to ‘best’ describe it. However, as is often the way, it’s not quite as simple as that…
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Myopia has traditionally been described as a refractive error: a focusing problem that makes distant objects appear blurred.
But that definition is no longer enough.
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Modern myopia science shows that most childhood myopia is not simply an optical inconvenience. It is commonly linked to excessive axial elongation, where the eye grows too long. As the eye lengthens, the risk of sight-threatening complications (usually later in life) increases.
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For this reason, myopia is increasingly being recognised as a disease process, especially when it is progressive, axial, or associated with higher levels of myopia.
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The most balanced answer is this:
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Not all myopia is the same. Low, stable refractive myopia may be considered a visual condition. Progressive axial myopia is increasingly recognised as a disease process. Pathological myopia is unquestionably a disease.
FOCUS
POINT
Myopia is not just blurred vision. In many children, it is caused by excessive eye growth, which can increase the lifetime risk of eye disease.
Why This Question Matters
For many families, myopia is still seen as a minor inconvenience. A child struggles to see the board at school. They are taken for an eye test. They are given glasses. The problem appears to be fixed.
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But this view is incomplete. Glasses correct the blurred vision caused by myopia. They do not necessarily address the underlying biological process that causes the eyeball to get longer and myopia to progress.
This matters because myopia usually develops during childhood, often progresses over several years, and can lead to higher levels of myopia by adulthood. The higher the myopia, the greater the lifetime risk of complications such as myopic maculopathy, [JH2.1]retinal detachment, glaucoma and cataracts.
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So, the question “Is myopia a disease?” is not just a semantic argument. It affects how parents, clinicians, educators, policymakers and healthcare systems respond to childhood myopia. If myopia is seen merely as a focusing problem, then correcting vision may seem sufficient. If myopia is understood as a progressive disease process, then prevention, monitoring and management become far more important.
What Is a Disease?
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A disease is generally understood to be an abnormal process that affects the structure or function of the body. It may be caused by genetic, developmental, environmental, infectious, inflammatory or other biological factors.
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A disease does not always need to cause immediate pain or obvious symptoms. Many recognised diseases begin silently, progress gradually, and only cause major harm later.
Glaucoma, a common eye disease, is often called ‘the silent thief of sight’.
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For example, hypertension can exist for years before causing a stroke. Osteoporosis can progress before causing a fracture. Type 2 diabetes can damage the body long before a person experiences major complications.​
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What Is a Condition?
A condition is a broader term. It describes a state of health or bodily function. Some conditions are temporary, some are lifelong, and some may or may not involve disease.
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For example, pregnancy is a condition, but not a disease. Presbyopia, the age-related loss of near focusing ability, is usually considered a normal age-related condition. Mild refractive error may also be described as a visual condition.
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So, while all diseases are conditions, not all conditions are diseases.
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This is where myopia becomes interesting.
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A simple focusing error may sound like a condition. But progressive axial elongation, increasing risk of pathology, and the need for active management sound much more like a disease process.
What Is a Disorder?
A disorder is usually used to describe a disruption of normal function. It may not always imply a clearly defined disease mechanism, but it does suggest that something is not working as expected.
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Myopia could reasonably be described as a visual disorder because it disrupts normal distance vision.
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However, “disorder” is probably the least useful term for parents because it does not explain the key clinical issue: excessive eye growth and increasing disease risk.
FOCUS
POINT
A disease is not defined only by how someone feels today. It is also defined by abnormal biological change, progression and future risk.
So Where Does Myopia Fit?
The answer depends on what type of myopia we are talking about.
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Not all myopia is the same.
Some myopia is primarily refractive. This means the focusing power of the cornea and lens causes light to focus in front of the retina, even though the eye may not be excessively long.
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But much of the myopia that concerns clinicians, researchers and public health experts is axial myopia. This means the eye is too long from front to back. The retina sits too far back in the eye, so light focuses in front of it. This is also the most common form of myopia.
This distinction is crucial:
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Refractive myopia describes an optical state.
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Axial myopia describes a structural change in the eye.
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Progressive axial myopia describes an ongoing disease process.
On this basis, progressive axial myopia clearly ticks many of the boxes commonly used to describe a disease.
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The debate is not really about whether myopia can be harmful. It can.
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The debate is about whether all myopia should be classified as a disease, or whether the term should be reserved for progressive, axial, or high forms
A More Useful Classification: Myopia as a Disease Spectrum
The most sensible approach is to view myopia as a spectrum.
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At one end, there may be low, stable refractive myopia with relatively low risk.
At the other end, there is pathological myopia with structural damage and sight-threatening complications.
Between these two ends is progressive axial myopia, especially in children. This is where the disease argument is strongest, because the eye is actively changing and future risk is increasing.
This framework allows for nuance.
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It avoids overstating the case by claiming that every person with mild, stable myopia has a disease in the same way that someone with myopic maculopathy does.
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But it also avoids the much bigger mistake: dismissing childhood myopia as “just needing glasses”.
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It must be noted that pathological myopia is a rare, congenital disorder, where myopia advances rapidly from birth with refractive error often reaching levels well over -20.00 dioptres. It can be related to various syndromes and is considered a disease, but is not related to lifestyle factors, like progressive childhood myopia.
The Problem with Calling Myopia “Just a Refractive Error”
A refractive error describes where light focuses in the eye. It tells us that distant objects are blurred. But it does not fully explain why the eye is myopic, whether the eye is still growing, or what risk that child may face later in life.
This is why the phrase “just a refractive error” can be misleading.
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It encourages a narrow view of myopia as something that only needs optical correction.
But in progressive childhood myopia, the prescription is not the disease. The prescription is a sign of what is happening inside the eye.
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The deeper concern is axial elongation. As the eye becomes longer, the retina and other internal structures may be stretched. This can increase the risk of long-term complications. That is why myopia management focuses not only on correcting vision, but also on slowing progression.
What Do Leading Organisations Say?
The debate has shifted significantly in recent years.
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The National Academies of Sciences, Engineering and Medicine published a major 2024 report titled Myopia: Causes, Prevention, and Treatment of an Increasingly Common Disease. The report recommended that myopia should be classified as a disease and treated as requiring medical diagnosis and management.
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The World Council of Optometry has also argued that simply correcting myopia is no longer sufficient. Its standard of care for myopia management includes mitigation, measurement and management.
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The World Health Organization has highlighted myopia as a major and growing global eye health issue, particularly because high myopia is associated with potentially preventable vision impairment.
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This matters because language changes behaviour:
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When myopia is described as a refractive error, the default response is correction.
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When myopia is described as a disease process, the default response becomes prevention, monitoring and management.
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However, this is not as recent a problem as it appears. The forerunner to the RAF in the UK, before the First World War, noticed that pilots, often young men and teenagers, were suffering from rapidly developing myopia. They learnt that what was called the peripheral refraction was focussing beyond the peripheral retina, somehow forcing the eyes to grow in size.
Also, a study in 1969, found that Innuit (native American) elders in Alaska, had less than a 1% prevalence of myopia, whereas their children and grandchildren living more ‘Western’ lifestyles (watching TV, attending school, reading, etc) had a prevalence of myopia close to 25%!
Why does any of this matter?
So, Is Myopia a Disease?
The answer is:
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Yes, myopia can reasonably be described as a disease, particularly when it is axial, progressive, high or pathological.
But the most accurate answer is more nuanced:
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Myopia exists on a spectrum. Low, stable refractive myopia may be best described as a visual condition. Progressive axial myopia is a disease process. High axial myopia and pathological myopia are diseases associated with increased risk of sight-threatening complications.
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This distinction matters because it helps parents understand why myopia management is important without creating unnecessary fear.
The aim is not to medicalise every child who needs glasses.
The aim is to recognise that childhood myopia can be progressive, structural and clinically significant.
And once we understand that, doing nothing is no longer a neutral option.
FOCUS
POINT
Myopia should not be dismissed as simply needing glasses. Progressive axial myopia is a disease process involving excessive eye growth, and it deserves active monitoring, management and public health attention.