Introduction

Maintaining optimal eye health is essential for overall well-being and enjoyment. Eyes serve as a window to the world, allowing us to appreciate the beauty of treasured books and captivating landscapes. From everyday tasks to professional pursuits, clear vision is indispensable. Healthy eyes are pivotal in bolstering mental and emotional well-being and nurturing independence and self-assurance.

Dietary nutrients impact eye health, influencing conditions such as age-related macular degeneration, retinal malfunction, dry eye syndromes, cataract development, and vision impairments.

Seafoods reduce a person's risk of developing eyesight impairments. Seafood is high in omega-3 fatty acids, so including it in your diet will provide you with enough antioxidants and help prevent conditions like macular edema, optic neuropathy, myopia, dry eye syndrome, colour blindness, and double vision.¹ Cold water fish, like sardines, mackerel, and tuna, are great sources of DHA and Omega-3 fatty acids, which support the structure of the cell membranes in the eyes and are suggested for treating macular degeneration, treating dry eye, and maintaining general vision.²

Understanding eye health

Components of eye health

1. Vision

Vision is the process by which your eyes and brain work together to enable you to see. It is the result of light bouncing off objects in your environment. It's one of the five senses and plays a significant role in how individuals see the world. 

When our eyes detect light, it is converted into codes of nerve impulses and sent to our brain via the optic nerve. The brain receives the signals and decodes them to create the images we see.³

2. Eye disease

There are countless types of vision problems and eye illnesses. While most are treatable, some are not. Maintaining a healthy lifestyle and visiting an eye doctor if your vision changes can help you take care of your own eye health.⁴

The following four eye conditions are the most prevalent ones that cause blindness or vision loss:

• Cataracts
• Diabetes-related retinopathy
• Glaucoma Age-related macular degeneration

3. Nutritional factors

Dietary carotenoids such as lutein and zeaxanthin are essential for eye health and maintenance. A plentiful source of carotenoids, yellow foods like corn, peppers and eggs protect the eyes from oxidative stress and damaging light. Supplements from food can increase consumption, but it's best to use caution to prevent taking too much.⁵

4. Role of diet in maintaining eye health

Omega-3 fatty acids, zinc, lutein, zeaxanthin, and vitamins C and E are associated with a decreased risk of cataract development, age-related macular degeneration (AMD), and other eye disorders in later life.

What does this diet, high in nutrients, look like? Let's find out.

• Vitamin C - Oranges, grapefruits, kiwifruits, strawberries, tomatoes, red and green peppers, and broccoli are foods high in vitamin C
• Vitamin E - Avocados, almonds, sunflower seeds, and olive oil are good sources of vitamin E
• Zinc - Eggs, dairy products, meat and seafood, legumes (beans and lentils), and seeds are all excellent sources of zinc⁶

Research on consumption of seafood and eye health

Omega-3 fatty acids are ’healthy fats’ because they lower triglycerides, protect against autoimmune diseases, and lessen oxidative stress, which is linked to eye issues.

Consuming fish provides a sufficient supply of vitamins, minerals, and omega-3 fatty acids to avoid macular degeneration, meibomian gland dysfunction, and vision impairment. Consuming fish provides vitamins, minerals, and omega-3 fatty acids, such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which support eye health and vision preservation. 

A study using a sample of 32,000 female participants demonstrated that eating fish high in omega-3 fats decreased the risk of dry eye syndrome by 17% compared to people who did not eat seafood. Regular seafood eaters are less likely to suffer from eye conditions like myopia (nearsightedness), colour blindness (inability to distinguish colour), and double vision (misalignment of one or both eyes). The following figure shows the relation between the dietary seafood consumption and the prevalence of ocular disorders.¹

Nutritional benefits of sardines

Cold-water fish, such as sardines, cod, mackerel, and tuna, are a great source of docosahexaenoic acid (DHA), which supports cell membrane structure and treats macular degeneration, dry eyes, and preserves vision.⁶ Omega-3 polyunsaturated fatty acids, or n-3 PUFAs, are abundant in sardines, a cheap fish.

Sardines are a better source of calcium and n-3 PUFA than other fish. They also contain a higher concentration of both n-3 PUFA and calcium. The calcium value of 100 g of sardines is the same as that of approximately 400 ml of milk. Sardines are a good source of calcium, magnesium, phosphorus, and vitamin D, to support bone metabolism.⁸

The following table⁸ shows the amount of nutrients present in cooked sardines:

Sardines versus fish oil supplements

The use of dietary supplements to treat chronic illnesses and nutritional deficiencies is still up for discussion. Maintaining or improving one's health is the primary motivation for most supplement users. 

Supplement use gives a person a sense of empowerment since it suggests they are actively working to extend their life and enhance their health. In the majority of developed countries, supplement use is thought to be close to half of the population. Although taking supplements is a practical approach to get your recommended daily intake of n-3 polyunsaturated fatty acids, it is unlikely that they would satisfy your hunger the same way as eating a piece of sardines or similar oily fish would. It's interesting to note that researchers looking into the benefits of n-3 PUFA and fish oil have shown that taking supplements of these can enhance hunger in both healthy and sick people.⁸

Incorporating sardines into the diet

With their rich flavour profile and adaptability, sardines are a culinary powerhouse. These little fish are incredibly nutritious and flavorful, whether they are eaten raw from the can, pickled, smoked, or perfectly grilled. They give umami and depth to any dish with their powerful, savoury taste, which goes well with anything from Asian stir-fries to Mediterranean salads. Sardines are a tasty addition to food, but they are also a nutritional powerhouse, containing high amounts of protein, calcium, vitamin D, and omega-3 fatty acids. Sardines are a common ingredient in kitchens since they are an inexpensive, sustainable option that can easily enhance any dish.

Recipes and meal ideas

1. Sardine pasta with crunchy parsley crumbs

An inexpensive approach to add some oily fish to your diet. Sardines in cans are a fantastic source of omega-3 and give this easy pasta dish for the family a boost.⁹

2. Spicy sardine dip

Frozen sardines can be quickly turned into a hot dip. This is a simple recipe that is ideal for any last-minute get-togethers.¹⁰

 3. Spaghetti with sardines

This store-cupboard dinner is incredibly quick and healthy as well.¹¹

Other strategies for maintaining eye health

One crucial aspect of your overall health is your eyes. Maintain healthy eyes even into your golden years by adhering to these easy recommendations.¹²

• Schedule an advanced eye examination
• Keep your blood sugar levels in control
• Know the history of eye health in your family
• Maintain a healthy weight
• Put on protective glasses
• Give up smoking or never begin
• Reduce your screen time

Summary

Since our eyes are the window through which we see the world, maintaining good eye health is crucial to living a happy and meaningful life. A clear eyesight is essential for navigating life with confidence and independence, from daily activities to professional endeavours. Sardines and other cold-water fish are great for maintaining eye health because they are high in omega-3 fatty acids, especially DHA. These nutrients help maintain the integrity of the cell membranes of the eyes, low risk of dry eyes, macular degeneration, and other visual problems. Sardines have a wealth of calcium, vitamin D, and other vital minerals that support the general health and well-being of the eyes.

Sardines and other nutrient-dense foods like fruits, vegetables, and whole grains are essential to include in the diet in order to protect and improve eye health. In addition, establishing good lifestyle practices like routine eye exams, eating a balanced diet, controlling blood sugar, and shielding the eyes from damaging environmental elements can all make a big difference in long-term vision preservation. To ensure a clearer, bright future, let's put our eye health first by adopting proactive lifestyle changes and wise food decisions.