AMD – Age-Related Macular Degeneration
AMD (Age-Related Macular Degeneration) is an eye disease that damages the central retina and causes vision loss. It primarily affects people aged 50 and older.
Things worth knowing about "AMD"
AMD (Age-Related Macular Degeneration) is an eye disease that damages the central retina and causes vision loss. It primarily affects people aged 50 and older.
What is AMD?
Age-Related Macular Degeneration (AMD) is a chronic eye disease that affects the central area of the retina, known as the macula. The macula is responsible for sharp, detailed central vision, which is essential for tasks such as reading, driving, and recognizing faces. AMD is one of the leading causes of vision loss in adults over the age of 50 in the developed world.
Causes and Risk Factors
The exact causes of AMD are not yet fully understood, but several factors are known to contribute:
- Age: Risk increases significantly after the age of 50.
- Genetics: Certain gene variants substantially increase the risk of developing AMD.
- Smoking: One of the most significant modifiable risk factors.
- Obesity and high blood pressure: These conditions negatively affect retinal blood flow.
- Light eye color: People with blue or green eyes may have a slightly higher risk.
- Prolonged UV exposure: Long-term exposure to sunlight may contribute to retinal damage.
Types of AMD
Dry AMD
Dry AMD (atrophic AMD) is the more common form, accounting for approximately 80–90% of all cases. It progresses slowly and is characterized by the accumulation of small deposits called drusen beneath the retina, along with a gradual breakdown of the light-sensitive cells in the macula.
Wet AMD
Wet AMD (neovascular AMD) is less common but far more aggressive. It involves the growth of abnormal blood vessels beneath the retina that leak fluid and blood, rapidly damaging the macula. Without treatment, wet AMD can lead to severe vision loss within weeks to months.
Symptoms
In the early stages, AMD often causes no noticeable symptoms. As the disease progresses, the following symptoms may develop:
- Blurred or distorted vision in the central visual field
- Straight lines appearing wavy or bent (metamorphopsia)
- A dark or blind spot in the center of vision (scotoma)
- Colors appearing faded or less vivid
- Difficulty reading or recognizing faces
Peripheral (side) vision is generally preserved in AMD, so complete blindness is rare.
Diagnosis
AMD is diagnosed by an ophthalmologist using a range of examination methods:
- Fundoscopy (eye examination): Direct visualization of the retina and macula.
- Amsler Grid Test: A simple self-test used to detect distortions in central vision.
- Optical Coherence Tomography (OCT): A detailed imaging technique that captures cross-sections of the retinal layers.
- Fluorescein Angiography: Imaging of retinal blood vessels using a contrast dye, particularly useful for detecting wet AMD.
Treatment
Dry AMD
There is currently no cure for dry AMD. However, research from the AREDS trials has shown that high-dose supplementation with specific antioxidants and zinc (including vitamins C and E, lutein/zeaxanthin, copper, and zinc) can slow the progression of intermediate to advanced AMD. Lifestyle changes such as quitting smoking and adopting a healthy diet are also strongly recommended.
Wet AMD
The treatment of wet AMD has been transformed by the introduction of anti-VEGF therapies. Medications such as ranibizumab, bevacizumab, and aflibercept are injected directly into the vitreous cavity of the eye. These drugs inhibit vascular endothelial growth factor (VEGF), which drives the growth of abnormal blood vessels. Regular injections are required and can stabilize or even improve vision in many patients.
Additional Treatment Options
- Photodynamic Therapy (PDT): A treatment using a light-activated drug (verteporfin), used in specific subtypes of wet AMD.
- Laser Photocoagulation: Now less commonly used, this technique can seal abnormal blood vessels in certain cases.
- Visual Rehabilitation: Magnification aids, specialized lenses, and assistive technology can help patients maintain independence in daily life.
Prevention
While AMD cannot be entirely prevented, the following measures can help reduce the risk:
- Avoid smoking or quit if you currently smoke
- Protect eyes from UV radiation by wearing sunglasses
- Eat a healthy diet rich in leafy green vegetables, oily fish, and antioxidants
- Have regular eye examinations from the age of 50 onwards
- Manage blood pressure and maintain a healthy body weight
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. AREDS Report No. 8. Archives of Ophthalmology, 2001.
- World Health Organization (WHO): Priority eye diseases – Age-related macular degeneration. who.int, 2023.
- 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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