Macular Degeneration – Causes, Symptoms & Treatment
Macular degeneration is an eye disease in which the macula – the area responsible for sharp central vision – becomes progressively damaged. It is a leading cause of vision loss in older adults.
Things worth knowing about "Macular Degeneration"
Macular degeneration is an eye disease in which the macula – the area responsible for sharp central vision – becomes progressively damaged. It is a leading cause of vision loss in older adults.
What is Macular Degeneration?
Macular degeneration is a disease of the retina in which the macula – the central part of the retina responsible for sharp, detailed vision – is progressively damaged. The macula allows us to see fine details, read, and recognize faces. When it is impaired, a blurry or dark spot appears in the central visual field. The disease does not cause complete blindness but can severely limit the ability to read, drive, or recognize faces.
Types of Macular Degeneration
Dry Macular Degeneration
The dry form is the most common type, accounting for approximately 80–90% of all cases. It develops through the gradual accumulation of metabolic waste deposits called drusen beneath the retina. Retinal cells deteriorate slowly over years, and vision loss typically progresses gradually.
Wet Macular Degeneration
The wet form is less common but significantly more aggressive. Abnormal new blood vessels grow beneath the retina and leak fluid and blood, leading to rapid deterioration of vision. Without treatment, substantial vision loss can occur within weeks or months.
Causes and Risk Factors
The exact cause of macular degeneration is not yet fully understood. It involves a complex interaction of genetic, age-related, and environmental factors:
- Age: Risk increases significantly after the age of 50 and is particularly high in people over 75.
- Genetic predisposition: Certain gene variants substantially increase the risk of developing the disease.
- Smoking: One of the strongest modifiable risk factors – smokers have a two- to threefold increased risk.
- UV radiation: Long-term exposure to sunlight can damage the retina.
- Diet: A diet low in antioxidants and omega-3 fatty acids may increase risk.
- High blood pressure and cardiovascular disease: These contribute to damage of the small blood vessels in the eye.
Symptoms
Macular degeneration is often symptom-free in its early stages. Typical signs include:
- Blurred or distorted vision in the central visual field
- Straight lines appearing wavy or bent (metamorphopsia)
- A gray or dark spot in the center of vision
- Colors appearing faded or less vivid
- Difficulty reading, even with corrective lenses
- Problems recognizing faces
Diagnosis
Diagnosis is made by an ophthalmologist using several examination methods:
- Funduscopy (ophthalmoscopy): Direct examination of the retina and macula.
- Amsler grid test: A simple self-test to detect distortions in the central visual field.
- Optical coherence tomography (OCT): High-resolution cross-sectional imaging of retinal layers.
- Fluorescein angiography: Imaging of retinal blood vessels using a contrast dye, particularly useful for diagnosing the wet form.
Treatment
Dry Macular Degeneration
There is currently no therapy that can fully halt the progression of the dry form. However, studies have shown that certain high-dose nutritional supplements – known as AREDS formulations (Age-Related Eye Disease Study) containing vitamins C and E, zinc, lutein, and zeaxanthin – can slow progression in advanced stages.
Wet Macular Degeneration
The wet form is primarily treated with anti-VEGF injections. Agents such as ranibizumab, aflibercept, or bevacizumab are injected directly into the vitreous of the eye. These drugs inhibit the growth of abnormal blood vessels and can stabilize or even improve vision. Treatment typically needs to be repeated at regular intervals.
General Recommendations
- Do not smoke, or quit smoking
- Wear UV-protective sunglasses in sunlight
- Follow a balanced diet rich in vegetables, fish, and antioxidants
- Have regular eye examinations from the age of 50
- Monitor blood pressure and cholesterol levels
References
- Age-Related Eye Disease Study Research Group – A Randomized, Placebo-Controlled, Clinical Trial of High-Dose Supplementation with Vitamins C and E, Beta Carotene, and Zinc for Age-Related Macular Degeneration and Vision Loss. Archives of Ophthalmology, 2001.
- World Health Organization (WHO) – World Report on Vision, 2019. Available at: https://www.who.int/publications/i/item/9789241516570
- Flaxman SR et al. – Global causes of blindness and distance vision impairment 1990–2020: a systematic review and meta-analysis. The Lancet Global Health, 2017.
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