The macula in ophthalmology: Diseases and treatment spectrum for macular degeneration

The macula, often referred to as the “yellow spot“, is a tiny area in the middle of the retina, but is of enormous importance for our vision. It is the place of sharpest vision – this is where we read, recognize faces and grasp details. However, it is precisely this central point of the eye that is susceptible to changes, especially in old age. Macular degeneration or macular edema can significantly impair vision and, in the worst case, lead to blindness in the central field of vision.

In this blog, you will find out what makes the macula so special, which diseases can affect it and which modern treatment options are available. We also show you how to recognize changes at an early stage and what aids can be used to maintain quality of life even with macular disease.

What is the macula – and why is it so important for vision?

The macula, also known as the “yellow spot”, is a small but central part of the retina – and plays a crucial role in our sharp vision. It is located exactly in the middle of the retina, opposite the pupil, at the back of the eye. Its main task: it enables the focusing of details, i.e. reading, recognizing faces or seeing sharply at a point in the center of the field of vision.

The macula contains the highest density of light-sensitive photoreceptors (cones), which are responsible for color vision and high resolution. Without a functioning macula, central visual acuity is severely limited – even if peripheral vision is usually retained.

Structure and position of the macula in the eye

The macula is located in the central middle of the retina and measures only a few millimeters in diameter – but is functionally the most significant point for our vision. In its center is the fovea centralis, the spot of absolutely sharpest vision. Here, image signals are forwarded directly to the visual center in the brain.

The macula is particularly susceptible to age-related changes, as metabolic waste products – so-called drusen – can accumulate in this area due to the constant metabolic process. These can damage the sensitive tissue and lead to macular degeneration.

Diseases of the macula: When the center of the retina is affected

Diseases of the macula specifically affect the point in the middle of the retina responsible for sharp vision. Probably the best-known disease in this area is age-related macular degeneration (AMD) – it is considered the most common cause of blindness in old age in Western countries. However, macular edema, gliosis or macular holes can also impair the function of the center of the retina.

What is macular degeneration – and who does it affect?

The age-related macular degeneration (AMD) is a chronically progressive disease of the retina that usually occurs from the age of 50. With increasing age, metabolic deposits (drusen) accumulate in the retinal pigment epithelium (RPE). These can disrupt the supply to the light-sensitive sensory cells (photoreceptors) and damage them in the long term.

Particularly affected are:

• People with a family history
• People with heavy sun exposure without protection
• Smokers and people with high blood pressure or diabetes

The disease usually begins inconspicuously – regular check-ups at the ophthalmologist are therefore essential.

Dry and wet macular degeneration in comparison

There are two main forms of AMD:

• Dry macular degeneration: It occurs much more frequently and usually progresses slowly. Here, drusen deposit under the retina, gradually damaging the surrounding tissue. There is no treatment for regression, but the course can be positively influenced with nutritional supplements and lifestyle factors.
• Wet macular degeneration: This form often develops from the dry form and is significantly more aggressive. In this case, leaky blood vessels grow under the macula and cause swelling, bleeding and rapid deterioration of vision. The standard treatment consists of intravitreal injections with drugs that inhibit vessel growth.

Early warning signs and symptoms of macular disease

An onset of macular degeneration or other diseases of the center of the retina often becomes noticeable gradually. The first warning signs include:

• Distorted vision (straight lines appear wavy or bent)
• Blurred letters when reading
• Fading contrasts and colors
• A dark or gray spot in the center of the image
• Difficulty recognizing faces

A simple tool for self-monitoring is the Amsler grid: a test pattern with a grid where distortions or missing lines can indicate macular changes.

Overview of other macular diseases

In addition to age-related macular degeneration (AMD), there are a number of other macular diseases that can impair the function of the center of the retina – often with similar symptoms such as blurred vision, distorted lines or reading difficulties. Three important diseases are presented here in an overview:

Macular edema – fluid accumulation in the center of the retina

A macular edema occurs when fluid accumulates in the macula due to inflammatory processes or leaky vessels. The result is a swelling of the center of the retina, which significantly impairs vision. Common triggers are:

• Diabetes mellitus (diabetic macular edema)
• Retinal vascular occlusions
• Inflammation (uveitis)
• Eye surgery, for example after cataract surgery

Symptoms:

• Distorted or blurred vision
• Problems when reading
• Reduced visual acuity

Macular hole – a hole in the macula

A macular hole is a small hole in the fovea centralis, the center of the macula. It is usually caused by traction forces between the vitreous body and the retina, especially in people over 60. It can also occur after surgery or injuries.

Symptoms:

• Sudden loss of central visual acuity
• A dark spot or blind spot in the center
• Distorted vision

Epiretinal gliosis – fine membrane on the retina

In epiretinal gliosis (also called macular pucker), a cellular membrane forms on the surface of the macula, which can contract and deform the retina. The causes are usually age-related, but can also occur after inflammation, injuries or surgery.

Symptoms:

• Distorted vision (“straight lines appear wavy”)
• Reduced visual acuity
• “Puckering effect” in central vision

How can macular diseases be detected?

Diseases of the macula often develop gradually – and remain unnoticed for a long time. This is precisely why regular ophthalmological examinations are important, especially from the age of 50 or if there is a known family history. Detected early, many macular diseases can be slowed down or treated well – before permanent damage to the center of the retina occurs.

Typical examination methods: OCT, Amsler grid & Co.

Various methods are available in modern ophthalmology for early detection and monitoring:

• OCT (Optical Coherence Tomography): Currently the most important imaging procedure. It enables non-contact, high-resolution cross-sectional images of the retina – ideal for detecting drusen, fluid accumulation or membranes.
• Amsler grid test: A simple grid with a fixation point in the middle. Anyone who sees distorted lines, waves or empty spots when looking at it should see an ophthalmologist promptly.
• Funduscopy (ophthalmoscopy): For direct assessment of the macula – usually after pupil dilation with eye drops.
• Fluorescein angiography: Used particularly for wet macular degeneration to make leaky vessels visible.

When is early diagnosis crucial?

The timing of diagnosis is crucial, especially for macular degeneration, macular edema or macular holes. If the disease is detected in the early stages, the chances of successful treatment are much higher. If left untreated, irreversible damage to the light-sensitive sensory cells can occur – with permanent impairment of central vision.

Treatment options for macular diseases

The treatment of macular diseases depends heavily on the type, the stage of the disease and the individual visual impairment.

Drug therapy – injections into the eye

The most important treatment for wet macular degeneration and macular edema are so-called intravitreal injections. In this process, drugs – usually so-called VEGF inhibitors – are injected directly into the vitreous cavity of the eye.

Effect of the medication:

• Inhibition of unwanted vessel growth
• Reduction of fluid accumulation in the retina
• Stabilization or even improvement of visual performance

The injections are given at regular intervals and under sterile conditions in the eye clinic. Today, they are the gold standard for many inflammatory or vascular macular diseases.

Laser treatment and surgical procedures

Depending on the findings, laser procedures or surgical interventions can also be used:

• Laser coagulation: selective cauterization of leaky vessels (less common today, but still in use, e.g., for vascular changes outside the macula)
• Vitrectomy: surgical removal of the vitreous body, e.g., for a macular hole or epiretinal gliosis
• Membrane peeling: in epiretinal gliosis, the fine membrane over the macula is carefully removed to smooth the retina again

These procedures are performed exclusively in specialized eye clinics and require a precise ophthalmological indication.

Living with macular degeneration – what helps in everyday life?

With advanced macular degeneration, especially the dry form, a cure is not possible – but there are numerous aids and strategies to make everyday life easier:

• Magnifying visual aids such as magnifying glasses, screen readers or electronic readers
• Enlarged font sizes on PCs, smartphones or e-readers
• Vision training and low-vision counseling by specialized opticians or clinics
• Lighting optimization in the living area, e.g., through glare-free lights and daylight lamps
• Psychological support if uncertainty or anxiety burdens everyday life

Important: Even with existing visual deterioration, regular check-ups at the ophthalmologist are worthwhile – because the progression can often be stopped or slowed down.