Summary:
- High myopia (600 degrees or more) physically elongates the eye, thinning the retina and surrounding tissue, raising your risk of serious complications beyond poor distance vision.
- The higher your degree, the greater your risk of myopic macular degeneration (MMD), retinal tears, and retinal detachment, with risk rising further as axial length increases beyond 26 millimetres.
- MMD and other retinal complications often develop with no symptoms. By the time you notice a change in your vision, irreversible damage may already have occurred.
- If you experience a sudden increase in floaters, flashes of light, or a shadow across your vision, contact a retinal tear specialist in Singapore the same day.
If you have been wearing glasses or contact lenses since childhood, you are probably used to updating your prescription every year or two. But if your prescription has climbed past 600 degrees, something more important than lens thickness is at stake.
High myopia is a structural condition that changes the shape of your eye over time, and those changes carry real risks for your long-term vision.
In this article, we’ll help you understand what is happening inside your eye and what to watch for so you can protect your sight.
Why The Degree Of Myopia Matters Beyond Lens Thickness
How A Highly Myopic Eye Differs Structurally From A Normal Eye
A healthy adult eye measures roughly 24 millimetres from front to back. In someone with high myopia (generally defined as 600 degrees or more), the eye may measure 26 millimetres or more.
That difference of a few millimetres may not seem significant, but it has consequences throughout the internal structure. As the eyeball elongates, the tissues at the back stretch to accommodate the increased length.
The retina (the light-sensitive layer lining the back of the eye), the choroid (the vascular layer beneath the retina that supplies it with oxygen and nutrients), and the sclera (the white outer wall of the eye) all thin as they stretch.
Thinning means reduced structural integrity and reduced blood supply to the areas of the retina most critical for detailed vision.
In a normal eye, these tissues remain relatively uniform in thickness and well supported. In a highly myopic eye, the architecture of the posterior (back) segment is fundamentally altered.
Unlike a changing glasses prescription, the elongation of the eyeball itself cannot be reversed. Once the eye has grown longer than normal, the tissues lining the back of the eye remain under greater mechanical stress for life. This is why high myopia is considered a structural eye condition rather than simply a refractive error that can be corrected with glasses or contact lenses.
Do Glasses or LASIK Remove the Risk of Myopia?
Many people assume that because their vision is clear with glasses, contact lenses, or LASIK, their high myopia has been “fixed”. However, these treatments only correct how light focuses onto the retina. They do not change the underlying length of the eyeball.
The structural changes associated with high myopia remain even after vision correction. This means that a person who sees perfectly after LASIK may still carry the same lifetime risk of retinal detachment, glaucoma, and other myopia-related eye conditions.
At Asia Retina Eye Surgery Centre, Dr Claudine Pang specialises in myopia control in Singapore and the diagnosis and treatment of retinal complications related to high myopia. Book an assessment.
When Does High Myopia Become A Risk To Your Vision?
For those still in the earlier stages, myopia control treatment options are available in Singapore to help slow progression before high myopia sets in. For those already above 600 degrees, the focus shifts to monitoring and managing the risks.
The risk of retinal tears, retinal detachment, and other complications increases progressively as the degree of myopia rises. People with severe or pathological myopia face substantially higher risks than the general population.
Age is also a factor. The cumulative risk increases over time as the eye continues to remodel, and as age-related changes in the vitreous (the gel that fills the interior of the eye) impose additional mechanical stress on an already-thinned retina.
Why High Myopia Can Cause Problems Without Symptoms
One of the challenges of high myopia is that many structural changes occur gradually and without causing symptoms. The retina itself cannot feel pain, and thinning or degeneration may progress unnoticed for years.
This means that even people with stable vision and no symptoms may already have changes that can only be detected during a retinal examination.
Retinal Tears And Detachment: Why High Myopes Are At Greater Risk
How Myopia Stretches And Thins The Retina
In people with high myopia, the outer areas of the retina are more likely to become thin and fragile. This can lead to areas of weakness in the retina, which develop because the eye has become stretched over time.
As the eye ages, the gel inside the eye can naturally pull away from the retina. In people with high myopia, this pulling can sometimes cause a tear in areas of the retina that have become weak. If a tear develops, fluid can pass through the opening and lift the retina away from the back of the eye, leading to retinal detachment.
Without surgical intervention, it can lead to permanent vision loss in the affected area.
Warning Signs Of A Retinal Tear Or Detachment
Seek a same-day or next-day assessment if you notice:
- A sudden, dramatic increase in floaters (dark shapes, strings, or cobwebs in your vision)
- Flashes of light, especially in your peripheral visual field
- A shadow, a curtain, or a dark veil creeping across any part of your vision
Many high myopes live with long-standing background floaters. What matters is change: something new, something sudden, something worse than before.
Retinal detachment is a medical emergency. If you notice any warning signs, arrange an eye examination with a retina specialist without delay.
How Quickly Can A Retinal Detachment Develop?
Some retinal detachments develop gradually over several days or weeks. Others, especially in people with high myopia and areas of retinal weakness, can progress very quickly and may lead to complete retinal detachment within hours.
A detachment caught before it reaches the macula has a much better outlook than one that has not. The faster you get retinal detachment treatment in Singapore, the better your chances of keeping your vision intact.
Beyond Retinal Detachment: Other Risks to Watch
Myopic Macular Degeneration: The Silent Risk
Detachment is not the only risk tied to a stretched retina.
The same elongation that thins and weakens the retina can also damage the macula, the part of the retina responsible for your sharpest, most detailed vision. This is known as myopic macular degeneration (MMD).
Unlike a retinal tear or detachment, MMD rarely announces itself with a sudden symptom. It tends to progress slowly, often only noticed once central vision has already started to blur or distort. By then, some of the damage may be permanent.
Because MMD develops quietly, the only reliable way to catch it early is through a dedicated retinal examination, rather than a standard vision check for glasses.
Glaucoma And Cataract Risk In High Myopes
High myopes are also at elevated risk of both glaucoma and cataract compared with the general population.
People with high myopia are also more likely to develop cataracts at a younger age than those without severe short-sightedness. They may also have a higher risk of glaucoma, although researchers are still studying exactly why this happens. Changes in the shape and structure of the eye caused by high myopia are thought to play a role.
Neither condition is inevitable. But if you have high myopia, both are worth monitoring.
When Should You Have A Retinal Assessment?
If you have high myopia and have never had a retinal assessment, some of these changes may develop without causing symptoms in the early stages. A comprehensive retinal examination can identify existing changes and determine whether ongoing monitoring or treatment is needed.
Book A Retinal Check With Dr Claudine Pang
If you have high myopia (600 degrees or more), consulting a retinal specialist in Singapore for a dedicated retinal exam is the only way to catch these changes early. A dedicated retinal examination can detect early signs of myopia-related complications before they threaten vision.
At Asia Retina Eye Surgery Centre, Dr Claudine Pang specialises in retinal complications and can offer guidance on myopia treatment in Singapore.
If you have not had a retinal check in the past year, or if you experience new flashes, floaters, or a curtain over your vision, contact us to arrange an assessment.
Stage | Name | What is happening |
1 | Mild NPDR | Small areas of swelling (microaneurysms) form in the retinal blood vessels |
2 | Moderate NPDR | More vessels become blocked or damaged |
3 | Severe NPDR | Widespread blockage deprives sections of the retina of its blood supply |
4 | Proliferative DR (PDR) | Abnormal new blood vessels begin to grow; the risk of significant vision loss is high |
Diabetic macular oedema (swelling at the central retina responsible for sharp, detailed vision) can occur at any stage and is one of the more common causes of vision loss in diabetics.
How Quickly Can It Progress?
The honest answer is that it varies considerably from person to person. Good control of blood glucose and blood pressure can slow things down significantly. Poor control can accelerate them. There is no reliable way to know where you sit without having your retina examined regularly.
Do not wait for your vision to change before you act. Book a diabetic eye screening with Dr Claudine Pang.
Who Should Be Getting Screened, and How Often?
Not everyone’s diabetic retinopathy screening schedule looks the same. How long you have had diabetes, which type you have, and what else is going on with your health all play a role.
The guidelines below are a starting point, but your eye specialist will advise you based on your individual situation.
Screening Guidelines for Type 1 and Type 2 Diabetes
If you have Type 1 diabetes, the recommendation is to have your first comprehensive eye examination within five years of diagnosis, and then annually after that. If you have Type 2 diabetes, you should be screened at the point of diagnosis, not five years later.
The reason is important: Type 2 diabetes is often present for some time before it is actually identified, which means retinal changes could already have begun by the time you receive your diagnosis. After a normal initial result, annual screening is the standard for most patients.
Risk Factors That May Mean You Need More Frequent Screening
You may need more frequent screening if any of the following apply to you:
- Poor long-term blood glucose control (high HbA1c)
- High blood pressure
- Kidney disease
- Pregnancy
- Long duration of diabetes
- Prior diagnosis of retinopathy at any stage
If several of these apply, your eye specialist may recommend screening every six months rather than annually.
Should You Go to a GP or a Specialist for Screening?
GPs and polyclinics in Singapore can carry out basic diabetic eye screening, and that is a perfectly reasonable starting point. But if your results show any signs of retinopathy, or if you have multiple risk factors, you should seek diabetic retinopathy treatment in Singapore from a retinal specialist.
A specialist has access to more detailed imaging technology and the clinical experience to interpret subtle findings accurately.
What Does a Diabetic Eye Screening Involve?
Here is what typically happens, step by step:
- Eye drops are applied to dilate your pupils. Allow 20 to 30 minutes for these to take effect. Arrange a lift home afterwards, as your vision will likely be blurred for a few hours.
- Fundus photography captures detailed images of your retina, optic disc, and blood vessels.
- Optical coherence tomography (OCT) produces cross-sectional images of the retina and can detect swelling or fluid at the macula before you notice any change in your vision.
- Fluorescein angiography may be used in some cases, involving a dye injected into the arm to highlight blood vessel activity and check for leakage or abnormal vessel growth.
- Your eye specialist reviews the images and grades any findings. Results are discussed with you at the appointment.
The whole appointment takes between 30 and 60 minutes. None of the tests is painful, though the bright light used during the examination can be briefly uncomfortable.
What Happens If Your Screening Reveals Something?
A finding on your screening is not a reason to panic. It does not automatically mean surgery, and it does not mean your vision is in immediate danger.
What it means is that your specialist now has something concrete to work with, and in the majority of cases, early findings are very manageable.
Understanding Your Results
Your results will be graded according to what, if anything, was found. A normal result means no signs of retinopathy were detected, and you will be advised when to return.
Mild or moderate findings typically point to closer monitoring and tighter blood glucose management rather than immediate intervention. More significant findings will open up a conversation about treatment options.
Diabetic Retinopathy Treatment Options in Singapore
The right treatment depends on what was found and how severe it is.
For diabetic macular oedema, anti-vascular endothelial growth factor (anti-VEGF) injections (medication injected directly into the eye to reduce abnormal vessel growth and fluid leakage) are typically the first-line approach and have shown strong results in stabilising or improving vision in many patients.
Laser photocoagulation (a procedure using focused light to seal leaking vessels or slow abnormal vessel growth) remains an option in certain cases. In severe PDR with significant bleeding, vitrectomy (surgical removal of the vitreous gel from the eye) may be considered.
How Early Detection Changes Your Treatment Outcome
The earlier the finding, the more options you have and the less intensive the treatment tends to be.
Patients identified at the mild or moderate NPDR stage are far less likely to need surgical intervention than those presenting with severe PDR or significant macular oedema.
Book a Diabetic Retinopathy Screening with Dr Claudine Pang
If you have diabetes, a dilated eye examination should be part of your routine, regardless of how sharp your vision feels today.
At Asia Retina Eye Surgery Centre in Singapore, Dr Claudine Pang and her team provide comprehensive diabetic retinopathy screening with retinal imaging, giving you a clear picture of where things stand and a plan for what comes next.