Age-Related Macular Degeneration (AMD)
What Is Age-Related Macular Degeneration (AMD)?
Age-related macular degeneration (AMD) is a progressive disease that affects the macula, the small central portion of the retina responsible for sharp, detailed vision. The macula allows you to read, recognize faces, drive, and perform tasks that require fine visual detail.
As AMD progresses, damage to the macula can reduce central vision while leaving peripheral (side) vision largely intact. Unlike glaucoma, which typically affects side vision first, AMD primarily impacts the center of your visual field.
AMD is one of the leading causes of vision loss among adults over the age of 50. Although it cannot always be prevented, early detection and regular monitoring play an important role in preserving vision and maintaining quality of life.
Types of Age-Related Macular Degeneration
01
Dry Age-Related Macular Degeneration
Dry AMD is the most common form, accounting for approximately 85–90% of cases. It develops gradually as the light-sensitive cells of the macula deteriorate over time. Small yellow deposits called drusen may accumulate beneath the retina and are often one of the earliest signs detected during an eye examination.
Dry AMD typically progresses slowly, although some individuals experience more rapid changes.
02
Wet Age-Related Macular Degeneration
Angle-closure glaucoma occurs when the drainage angle between the iris and cornea becomes partially or completely blocked, causing eye pressure to rise rapidly. Acute angle-closure glaucoma is a medical emergency and requires immediate treatment to prevent permanent vision loss.
Symptoms of AMD
The symptoms of AMD depend on the stage and type of disease.
Common symptoms include:
- Blurred or distorted central vision
- Difficulty reading
- Straight lines appearing wavy or bent (metamorphopsia)
- Reduced ability to recognize faces
- Colors appearing less vibrant
- A dark or empty spot in the center of vision in advanced disease
- Increased need for brighter lighting when reading or performing detailed tasks
Early AMD may not produce noticeable symptoms, which is why routine comprehensive eye examinations are important.
What Causes AMD ?
The exact cause of AMD is not fully understood. Researchers believe it results from a combination of aging, genetics, and environmental factors that affect the retina and retinal pigment epithelium over time.
In dry AMD, degeneration of retinal cells gradually affects central vision.
In wet AMD, abnormal blood vessels develop beneath the retina and may leak fluid or blood, causing damage to the macula.
Risk Factors
Several factors increase the risk of developing AMD, including:
- Age over 50
- Family history of AMD
- Cigarette smoking
- High blood pressure
- Cardiovascular disease
- Obesity
- Diet low in leafy green vegetables and antioxidants
- Excessive ultraviolet light exposure
- Caucasian ancestry
Smoking is considered one of the strongest modifiable risk factors for AMD progression.
How Is AMD Diagnosed ?
Age-related macular degeneration is diagnosed during a comprehensive retinal examination.
Your ophthalmologist may perform:
- Dilated eye examination
- Optical Coherence Tomography (OCT)
- Retinal photography
- Fundus autofluorescence imaging
- Fluorescein angiography when indicated
- Visual acuity testing
- Amsler grid evaluation
These tests help identify drusen, retinal swelling, fluid, bleeding, or other changes involving the macula.
Possible Complications ?
Without appropriate monitoring, AMD may lead to:
- Progressive central vision loss
- Difficulty reading
- Difficulty driving
- Reduced ability to recognize faces
- Loss of fine visual detail
- Permanent central blind spots in advanced disease
Peripheral vision is usually preserved, meaning complete blindness is uncommon.
Can AMD Be Prevented ?
Although AMD cannot always be prevented, certain healthy lifestyle habits may reduce the risk of progression.
Recommendations include:
- Avoid smoking
- Maintain healthy blood pressure and cholesterol levels
- Eat a diet rich in leafy green vegetables and fish
- Exercise regularly
- Wear sunglasses that provide UV protection
- Schedule regular comprehensive eye examinations
For some patients with intermediate AMD, specific nutritional supplements based on the AREDS2 (Age-Related Eye Disease Study
2) formulation may be recommended by their ophthalmologist. These supplements are not appropriate for everyone and should only be taken after an eye examination.
When Should You See an Ophthalmologist?
Schedule a comprehensive eye examination if you:
- Notice blurred or distorted central vision
- See straight lines appearing wavy
- Experience difficulty reading or recognizing faces
- Have a family history of AMD
- Are over age 50 and have not had a recent dilated eye examination
If you experience a sudden change in central vision or notice new distortion, seek prompt ophthalmic evaluation, as these may be signs of wet AMD requiring urgent assessment.
Frequently Asked Questions
No. AMD affects the macula and primarily impacts central vision, while glaucoma damages the optic nerve and typically affects peripheral vision first.
AMD rarely causes total blindness because peripheral vision is generally preserved. However, advanced AMD can significantly impair central vision and daily activities.
Drusen are yellow deposits that accumulate beneath the retina. Small drusen may be a normal part of aging, while larger or more numerous drusen are associated with an increased risk of AMD.
No. Most individuals with dry AMD never develop wet AMD, although dry AMD can progress to the wet form in some patients.
Many people with early AMD have no noticeable symptoms. Routine eye examinations allow retinal changes to be detected before significant vision loss occurs.
