Macular Degeneration: caring for the center of vision

Macular degeneration is a disease of the macula, the tiny area at the center of the retina responsible for detail vision, recognizing faces, and reading. If we imagine the retina as the film in a camera, the macula is its central, high-definition point: it is thanks to the macula that we read these lines and recognize a person from a distance. When it becomes diseased, it is precisely the center of the image that is affected, while side vision remains preserved for a long time.

The most common form is age-related macular degeneration (AMD), which affects roughly 5% of the population over the age of sixty-five and is, in Western countries, the leading cause of severe vision loss in the elderly. However, macular conditions can also be linked to high myopia, diabetes, or changes at the junction between the retina and the vitreous body.

Anatomy of the eye: the macula is the central region of the retina responsible for detail vision.

Dry and wet: two faces of the same disease

Broadly speaking, macular degeneration comes in two forms. The dry (atrophic) form is the most common and the slowest: the macula thins and drusen appear, small yellowish deposits under the retina. The wet (neovascular) form, less common but far more aggressive, is characterized by the growth of abnormal, fragile blood vessels that bleed and rapidly damage the macula. This latter form must be treated like a forest fire: it is essential to act quickly to put out the fire and preserve as many intact retinal cells as possible.

The first warning signs

Typically, the patient notices that straight lines — a doorframe, the lines on a sheet of paper — appear wavy or distorted; this symptom is called metamorphopsia. A blurred central spot (scotoma) may appear, along with difficulty reading despite wearing glasses, and less vivid colors. A very simple test, the Amsler grid, allows distortions to be monitored at home and any changes to be noticed early.

The Amsler grid: normal on the left, the distortion perceived in macular degeneration on the right.

Diagnosis

Today the key examination is OCT (optical coherence tomography), a quick, non-invasive test that images the retina layer by layer with a resolution of a few thousandths of a millimeter, detecting early both the drusen of the dry form and the fluid of the wet form. When needed, this is complemented by fluorescein angiography or angio-OCT to study the retinal vessels.

Available treatments

For the wet form, the breakthrough came with anti-VEGF drugs, molecules that block the growth of abnormal vessels and are administered via intravitreal injections — quick and well tolerated, repeated according to personalized schedules. For the dry form, there is not yet a definitive treatment, but according to the AREDS2 studies, certain supplements based on lutein, zeaxanthin, and antioxidants can slow its progression in intermediate stages; protection from light and quitting smoking also remain essential.

In conclusion

Macular degeneration teaches a valuable lesson: in the wet form, time is vision, and every week gained in diagnosis can make a difference. Since the first warning signs are often subtle, a comprehensive eye exam including OCT is truly essential in an aging population, both for properly assessing the retina and for catching the disease while a great deal can still be done.