Macular Degeneration (Age-Related)
Macular degeneration (age-related macular degeneration) is a retinal condition affecting the macula, the central part of the retina, and is one of the leading causes of central vision loss in older adults.
Prof. Dr. Fevzi Şentürk
Ophthalmology · Istanbul
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Macular degeneration is a retinal condition in which the macula — the part of the retina responsible for sharp central vision — gradually deteriorates, affecting central vision.
What Is Macular Degeneration (Age-Related Macular Degeneration)?
Age-related macular degeneration (AMD) occurs when the macula — the central retinal region that provides detailed vision — undergoes progressive structural deterioration. This condition represents a significant cause of central vision loss among older individuals.
Both eyes may be affected, though the rate and extent of progression can vary between them.
What Are the Types of Macular Degeneration?
Dry Macular Degeneration
The more prevalent variant is characterised by progressive thinning of macular tissue layers and accumulation of small yellowish-white deposits known as drusen. This form typically advances at a gradual pace.
Wet Macular Degeneration
This variant arises when abnormal, delicate blood vessels develop beneath the macula (choroidal neovascularisation). Fluid leakage or haemorrhage from these vessels may result in swift and substantial vision loss.
What Are the Symptoms of Macular Degeneration?
- Straight lines that appear distorted or undulating
- Blurred or absent areas in the central visual field
- Perception of colour as less vibrant
- Challenges with reading and facial recognition
- Noticeably diminished vision under dim lighting conditions
Because peripheral vision typically remains unaffected, individuals may not detect changes in their daily activities for an extended period.
How Is Macular Degeneration Diagnosed?
Evaluation includes:
- Comprehensive dilated eye examination
- Optical coherence tomography (OCT) — detailed cross-sectional imaging of the macular region
- Fluorescein angiography — employed when assessment of blood vessel characteristics is warranted
- The Amsler grid test — a practical self-assessment method for home monitoring
How Is Macular Degeneration Treated?
Approach for the Dry Type
No current treatment entirely arrests dry-type progression, although certain vitamin and mineral formulations (such as AREDS2) may contribute to slowing disease advancement in selected individuals. Ongoing retinal monitoring remains essential.
Approach for the Wet Type
Anti-VEGF injections into the eye represent the principal therapeutic approach for wet macular degeneration in contemporary practice. These agents function to limit abnormal blood vessel proliferation, reduce fluid and blood leakage, maintain current vision levels, and occasionally result in partial vision gain. Treatment typically consists of periodic injections administered according to a predetermined schedule.
What Should Be Monitored With Macular Degeneration?
- Routine self-examination using the Amsler grid
- Immediate medical assessment if distortion of straight lines or rapid central vision changes occur
- Evaluation of smoking habits where relevant
- Management of related systemic conditions including hypertension and hypercholesterolaemia
- Consistent attendance at scheduled ophthalmological assessments
How Does Macular Degeneration Affect Daily Life?
Since macular degeneration primarily impacts central vision, activities requiring detailed visual perception — such as reading, writing, identifying individuals and vehicle operation — may present increasing difficulty. Peripheral vision preservation typically allows for continued independent mobility to a meaningful degree. Vision rehabilitation services and optical aids including magnification devices can facilitate functional independence.
Should macular degeneration be suspected, timely clinical assessment is advisable in order to explore vision-preservation treatment options within an appropriate timeframe.
Frequently Asked Questions
What is macular degeneration?
Macular degeneration, medically known as age-related macular degeneration (AMD), develops when the macula — the central part of the retina — gradually deteriorates structurally, primarily affecting central vision.
What is the difference between dry and wet macular degeneration?
The dry type involves thinning of macular tissue layers and the accumulation of deposits called drusen, and usually progresses slowly. The wet type is characterised by the growth of abnormal blood vessels beneath the macula (choroidal neovascularisation) and can cause faster vision loss.
What are the symptoms of macular degeneration?
Common symptoms include straight lines appearing wavy, blurring or gaps in central vision, altered colour perception, and difficulty reading. Peripheral vision is usually preserved.
How is macular degeneration diagnosed?
Diagnosis relies on a dilated eye examination, optical coherence tomography (OCT), and, when needed, fluorescein angiography. The Amsler grid test is also a useful monitoring tool.
Who is more likely to develop macular degeneration?
Older age, smoking, a family history of macular degeneration, and certain genetic factors are associated with increased risk.
How is wet macular degeneration treated?
The most commonly used treatment for the wet type today is anti-VEGF injections administered into the eye. This treatment aims to suppress abnormal blood vessel growth and preserve existing vision.
Is there a treatment for dry macular degeneration?
For the dry type, certain vitamin and mineral supplements (such as the AREDS2 formulation) may help slow progression in some patients. Regular follow-up is important because the dry type can progress to the wet type over time.
Does macular degeneration always lead to complete vision loss?
Macular degeneration mainly affects central vision, while peripheral vision is usually preserved. Complete blindness is therefore rare, though detailed tasks such as reading and recognising faces can become more difficult.
Is it possible to prevent macular degeneration?
Avoiding smoking, maintaining a balanced diet, having regular eye examinations, and keeping associated conditions such as high blood pressure under control can help manage risk.
Treatments often evaluated together
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Intravitreal Injection
Intravitreal injection is a procedure used to treat retinal diseases such as macular degeneration, diabetic macular oedema and retinal vein occlusion, in which medication is delivered directly into the eye.
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Diabetic Retinopathy
Diabetic retinopathy is a retinal disease caused by long-term high blood sugar damaging the blood vessels of the retina, and is one of the major causes of vision loss in people with diabetes.
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Vitrectomy
Vitrectomy is a surgical procedure in which the eye's vitreous gel is removed, used to treat a range of retinal conditions such as retinal detachment, complications of diabetic retinopathy and macular hole.
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