Diabetic Macular Oedema
Diabetic macular oedema (DMO) is the leading cause of vision loss in working-age adults with diabetes. It occurs when damaged retinal blood vessels leak fluid into the macula, causing central vision to become blurred and distorted. Learn the symptoms, causes, diagnosis, and when treatment is required.
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Carol PeelWhat Is Diabetic Macular Oedema?
Diabetic macular oedema (DMO) is the accumulation of fluid within the macula — the central part of the retina responsible for sharp, detailed vision — as a consequence of diabetic retinopathy. It is the most common cause of visual impairment in people with diabetes in the UK.
In DMO, chronically elevated blood glucose damages the walls of retinal capillaries, causing them to leak fluid and lipid into the macular tissue. This swelling distorts and blurs central vision, impairing the ability to read, drive, and perform fine detail tasks. DMO can affect one or both eyes and may develop at any stage of diabetic retinopathy, including when the underlying retinopathy appears relatively mild.
In its early stages, DMO may cause no noticeable symptoms, making regular diabetic eye screening essential for all people with diabetes. When centre-involving DMO is detected, anti-VEGF injections are the gold standard treatment and restore or preserve vision in the majority of patients.
Symptoms of Diabetic Macular Oedema
Symptoms may develop gradually or be noticed suddenly. Early DMO can be entirely symptom-free, which is why all people with diabetes should attend their annual diabetic eye screening appointment.
Causes & Risk Factors
DMO develops when diabetes-related damage to retinal blood vessels causes fluid to accumulate in the macula. Several systemic factors accelerate this process and increase the risk of severe vision loss.
Chronically Elevated Blood Glucose
Persistently high blood sugar is the primary driver of DMO. Hyperglycaemia damages the walls of retinal capillaries, causing them to become abnormally permeable. Fluid, protein, and lipid leak from these vessels into the surrounding retinal tissue, accumulating in the macula.
Hypertension (High Blood Pressure)
Elevated blood pressure significantly worsens retinal vascular disease in people with diabetes, increasing the rate of fluid leakage and accelerating the development of macular oedema. Tight blood pressure control is a key element of DMO management.
Duration of Diabetes
The longer a person has had diabetes, the greater their cumulative exposure to hyperglycaemia-induced vascular damage. DMO risk increases substantially with diabetes duration and is particularly high in those with longstanding poor glycaemic control.
Poor Glycaemic Control (High HbA1c)
HbA1c levels consistently above the target range directly increase the risk of DMO onset and progression. Achieving and maintaining tight glycaemic control remains the single most effective strategy for preventing macular oedema in people with diabetes.
Diabetic Nephropathy and Fluid Retention
Diabetic kidney disease reduces the body's ability to regulate fluid balance, worsening macular oedema. Anaemia associated with nephropathy further compromises retinal oxygen delivery, compounding the effects of vascular leakage.
Hyperlipidaemia (High Cholesterol)
Elevated blood lipids are associated with increased hard exudate deposition within the macula, a marker of severe lipid extravasation that can cause direct photoreceptor damage and permanent central vision loss if untreated.
Pregnancy
Diabetic retinopathy and DMO can worsen significantly during pregnancy, particularly in women with pre-existing retinal disease. Close ophthalmic monitoring throughout pregnancy is essential for women with diabetes.
Diagnosis and Assessment
A comprehensive assessment combines retinal imaging with systemic review to confirm the diagnosis, determine the severity and pattern of macular oedema, and optimise the medical factors that influence treatment response and long-term outcomes.
OCT Imaging
Optical coherence tomography is the gold standard for diagnosing and monitoring DMO. It measures macular thickness precisely, identifies the pattern of oedema (focal, diffuse, or cystoid), detects subretinal fluid, and quantifies the response to anti-VEGF or steroid treatment at each follow-up visit.
Dilated Fundus Examination
The retina is examined through a dilated pupil to grade the severity of underlying diabetic retinopathy, identify hard exudates threatening the macula, and detect neovascularisation or haemorrhage that may require additional treatment.
Fluorescein Angiography
Dye-based retinal imaging identifies the source and pattern of vascular leakage, areas of capillary non-perfusion, and retinal neovascularisation. It is particularly useful when assessing ischaemic DMO or planning focal laser therapy.
Systemic Review
HbA1c, blood pressure, cholesterol, and renal function are reviewed to optimise glycaemic and cardiovascular control. These systemic factors directly influence the response to retinal treatment and the long-term prognosis for vision.
When to Seek Advice
Contact your eye specialist promptly if you have diabetes and notice any of the following:
- Blurred or distorted central vision in one or both eyes
- Straight lines appearing wavy or bent
- Difficulty reading despite an adequate glasses prescription
- Fluctuating vision, particularly in relation to blood glucose levels
- Colours appearing less vivid or washed out
- Any new visual symptom if you have a known diagnosis of diabetic retinopathy
“Diabetic macular oedema can develop silently before any symptoms become apparent. Regular diabetic eye screening, combined with tight glycaemic and blood pressure control, remains the most effective strategy for preventing sight loss in people with diabetes.”
Treatment Options
These are the treatment options available at The Eye Doctor Clinic for diabetic macular oedema.
Anti-VEGF Intravitreal Injections
Anti-VEGF injections are the first-line treatment for centre-involving diabetic macular oedema. They reduce vascular permeability and fluid leakage, decrease macular thickness, and improve visual acuity in the majority of patients. Regular injections are typically required, with the frequency guided by OCT monitoring.
Learn moreSteroidal Intravitreal Injections
Steroidal intravitreal injections and sustained-release implants provide durable anti-inflammatory and anti-oedema effects. They are used in patients who have not responded adequately to anti-VEGF therapy, or as a primary treatment option in specific clinical circumstances.
Learn moreRetinal Surgery
Vitreoretinal surgery may be indicated in DMO cases complicated by vitreomacular traction, epiretinal membrane formation, or vitreous haemorrhage. Surgical release of traction can significantly reduce macular oedema in selected patients who do not respond to injections alone.
Learn moreMeet the Team
Where to Find Us
Three convenient locations across West Yorkshire. Visit us for consultations, diagnostics, and treatments.
Bolton
136 – 140 Newport St
Bolton, Greater Manchester
BL3 6AB
Huddersfield
Woodlands, 4 Longbow Close
Huddersfield, HD2 1GQ
Book a Diabetic Macular Oedema Assessment
If you have diabetes and are experiencing changes in your central vision, a specialist assessment at The Eye Doctor Clinic will confirm the diagnosis and arrange prompt treatment to protect and preserve your sight.
