Nutrition and Vitamins for Macular Disease

What Is the Macula?

The macula, or yellow spot, is the part of the retina at the back of the eye that provides central vision. This part of the retina is present in everyone. The macula makes clear, detailed vision possible. It plays a critical role in activities that require detailed and central vision, such as recognizing faces, reading and writing. It is called the yellow spot because it is an area dense in colored pigments, and it is vital to the healthy functioning of the retina. It is very sensitive to a lack of oxygen, so if the oxidant–antioxidant balance in the body and retina is disturbed, the macula is affected and various diseases appear.

These diseases include age-related macular disease (macular degeneration), which causes damage and deterioration of the yellow spot; macular edema (swelling) due to diabetes or retinal vascular occlusion; a hole in the macula (medically called a macular hole); a membrane over the macula (an epiretinal membrane); and hereditary macular diseases (such as Stargardt disease, cone dystrophy and retinitis pigmentosa).

Age-Related Macular Disease

When we speak of macular diseases, dozens of conditions are involved, but the one seen especially in people over 55, in which damage to the macula leads to loss of central vision, is "age-related macular disease," the most common and best-known retinal disease among the public. The macula is the region of the retina that gives us sharp, detailed central vision. As the disease progresses, it impairs central vision and makes daily activities difficult. It is also known as age-related macular degeneration (AMD).

Types of Age-Related Macular Disease

Dry-type macular degeneration is the most common form (about 80% of patients have this type) and progresses slowly. It occurs when retinal cells gradually degenerate and the macula thins. Small yellow deposits called drusen that accumulate under the retina cause vision loss. In the dry type, patients usually lose central vision slowly, and in more advanced stages serious vision loss can occur.

Wet-type macular degeneration is less common but causes faster and more serious vision loss. Abnormal blood vessels grow under the retina, and these vessels leak and damage the macula. This can cause rapid vision loss and permanent damage. Bleeding from the diseased vessels and leakage of fluid lead to reduced vision.

Symptoms

Loss of central vision: macular disease especially affects central vision. You may feel blurring, a dark spot or gaps in the center of your sight. This particularly impairs the functions we perform with central vision, such as reading, recognizing faces and driving. Straight lines appearing curved: because the shape of the macula is distorted, straight lines may look wavy or bent. Impaired color perception: colors may appear paler and less distinct. Slow vision loss: while dry-type degeneration usually progresses slowly, the wet type can cause sudden reduction in vision. As the disease progresses, vision loss may increase. These serious losses can also lead to household accidents such as falls and bumps due to poor vision, especially in older patients.

Causes and Risk Factors

The risk increases in people aged 55 and over. It is higher in those with a family history of macular disease. Smoking doubles the risk of the disease. Obesity and high blood pressure can accelerate the development of macular disease.

Treatment Methods

Anti-VEGF injections: in wet-type macular degeneration, these are intraocular injections used to stop the growth of abnormal blood vessels. Anti-VEGF agents (vascular growth factor inhibitors) slow vision loss by preventing the vessels from leaking and growing. These injections usually need to be given more frequently at first (roughly once a month) and then repeated at certain intervals.

Vitamin and mineral supplements: studies on dry-type macular degeneration show that certain vitamins (vitamins C and E, lutein, zinc and omega-3) slow its progression. These vitamin and mineral supplements, determined by the AREDS study carried out on thousands of people, can slow the progression of the disease.

Preventive Measures

Balanced nutrition: eating foods rich in antioxidants such as lutein and zeaxanthin (green leafy vegetables like spinach and cabbage) can contribute to eye health. Increasing omega-3 intake, a diet rich in antioxidant foods such as walnuts, flaxseed and broccoli, choosing olive oil instead of solid fats, and white meat instead of red meat are recommended. Quitting smoking: smoking accelerates macular degeneration, and quitting greatly reduces the risks. Wearing sunglasses: using UV-protective sunglasses outdoors to minimize exposure to UV rays is important for retinal health.

Progression and Prognosis

If macular diseases are not treated, they progress; age-related macular degeneration in particular is a condition that gradually reduces vision. While the dry type progresses slowly, the wet type can progress much faster and cause serious vision loss. Early diagnosis is of great importance for the success of treatment.

Nutrition and Macular Disease

Age-related macular degeneration is a retinal disease that can cause progressive vision loss in older age. Nutrition and vitamin supplements can slow the progression of this disease and reduce its risk. Macular disease is perhaps the eye condition most affected by diet. A Mediterranean-type diet is important for this disease, and patients who follow these dietary recommendations may slow its course. The Mediterranean diet is also beneficial for general body health. A balanced and healthy eating habit can reduce the risk of age-related macular degeneration. Some foods support eye health thanks to their antioxidant properties.

Beneficial Foods

Foods containing lutein and zeaxanthin: these carotenoids are naturally found in the retina and macula and reduce oxidative stress, helping to prevent light damage in the eye. Sources: spinach, cabbage, broccoli, corn, peas, egg yolk, kale and squash.

Omega-3: supports the structure of retinal cells, reduces inflammation and protects macular health. Sources: salmon, sardines, mackerel, walnuts, flaxseed and chia seeds.

Antioxidant-rich foods: neutralize free radicals to protect eye health. Sources: citrus fruits (orange, lemon, grapefruit), strawberries, blueberries and raspberries.

Zinc-containing foods: support retinal cells and reduce the risk of age-related macular degeneration. Sources: red meat, turkey, seafood (especially oysters), pumpkin seeds, almonds and whole grains.

Vitamin E foods: a strong antioxidant that can help prevent retinal damage. Sources: sunflower seeds, almonds, hazelnuts and vegetable oils.

Vitamin C foods: protect retinal tissue against free-radical damage. Sources: orange, lemon, kiwi, red pepper and broccoli.

Beta-carotene foods: convert to vitamin A and support eye health. Sources: carrots, sweet potatoes and pumpkin.

Eating Style

For elderly patients, the eating style should be planned carefully, taking into account intestinal absorption problems and increased vitamin and mineral needs. The diet known as the Mediterranean type is low in saturated and solid fats and rich in unsaturated fats (such as olive oil); it should favor white meat instead of red meat and be especially fish-based. Foods rich in dark green and orange vegetables and plenty of fiber, with less processed food, sugar and carbohydrate, should be preferred.

General Recommendations

Antioxidant-focused diet: increase consumption of vegetables and fruit; in particular, dark green leafy vegetables (a source of lutein and zeaxanthin) should be eaten, and citrus and red fruits rich in vitamin C should be added to the daily diet. Protein sources: eating oily fish 2–3 times a week is recommended, and plant protein sources such as lentils and chickpeas should be included. Healthy fats: omega-3-rich foods and healthy fats such as olive oil should be used. Whole grains: complex carbohydrates such as whole-grain bread, oats and brown rice should be preferred over refined carbohydrates. Avoid sugar and salt: for blood-sugar control and blood-pressure regulation, sugary and salty foods should be avoided.

Benefits of the Mediterranean Diet for General Health

The Mediterranean diet supports heart and vascular health, lowers bad cholesterol (LDL) and raises good cholesterol (HDL), reduces the risk of type 2 diabetes, protects brain health and lowers the risk of Alzheimer's and Parkinson's disease, strengthens the immune system, helps with weight control and reduces cancer risk.

Tips for Absorption Problems

In elderly patients, the following measures can be taken because of absorption problems. Use of supplements: combined supplements containing the AREDS 2 formulation (lutein, zeaxanthin, zinc, copper and vitamins C and E) can be used. Vitamin D is indirectly important for eye health, and a supplement should be taken if there is a deficiency. Easily digestible foods: boiled or steamed vegetables should be preferred over raw vegetables, and probiotics (yogurt, kefir) can support gut health. Fluid intake: adequate fluid intake should be ensured to regulate bowel movements and ease digestion.

Vitamin and Mineral Supplements

Research has shown that certain vitamin and mineral supplements may be beneficial in patients with age-related macular degeneration. In our country there are more than ten medicines that contain this vitamin group. These are mainly fat-soluble vitamins, so they are best taken during or after breakfast. The AREDS (Age-Related Eye Disease Study) studies in particular have shown that the following are effective. Lutein and zeaxanthin support retinal health and prevent damage from UV rays. Vitamin C (500 mg) has a strong antioxidant effect. Vitamin E (400 IU) prevents oxidative damage to cell membranes. Zinc (80 mg) supports retinal health and enhances antioxidant effects. Copper (2 mg) prevents the copper deficiency caused by high-dose zinc intake. Omega-3 supplements, especially fish-oil supplements containing DHA and EPA, support retinal function.

Points to Keep in Mind

Reduce smoking and alcohol consumption: smoking increases the risk of macular degeneration, and beta-carotene supplements are not recommended for smokers because they may increase the risk of lung cancer. Have regular eye check-ups: early diagnosis is critical in slowing the progression of the disease. Avoid highly processed foods: processed foods such as sugar, white flour and trans fats can increase inflammation. Wear sunglasses: you can protect retinal health by reducing exposure to UV rays. Do not neglect blood-pressure and cholesterol control: high blood pressure and cholesterol can adversely affect macular health, so a low-sodium diet and nutrition that supports cardiovascular health are recommended.