Dry Eyes: Nutrients and Nutrition from Within

The screen flickers, the heating air is dry, and by evening your eyes are burning as if you'd spent hours staring into the wind. Dry, tired eyes have become an everyday phenomenon — and many people wonder whether diet can help. The short answer: lifestyle is no substitute for an eye examination, but an eye-friendly diet supplies building blocks that genuinely play a role in healthy eyes.

What's behind dry eyes

Our eyes are coated with a fine tear film — a thin layer of water, mucus and an oily component that slows rapid evaporation. When this film is out of balance, the typical feeling of dryness, grittiness or burning sets in. There are many causes: long, focused screen time with reduced blinking, dry indoor air, draughts, contact lenses, hormonal changes or certain medications.

Diet is just one factor among several here — but one you have in your own hands. The eyes are metabolically active organs, and like any tissue they need a good baseline supply of fluid, fatty acids and micronutrients. That's exactly where the view from within comes in, while external triggers should be considered separately. You'll find a broader overview of eye-relevant micronutrients in our guide on Nutrients for the Eyes.

Fluid: the simplest lever

Before getting into individual nutrients, it's worth looking at your glass. The tear film consists largely of water, and anyone who drinks too little during the day often feels it in the mucous membranes too — eyes and mouth included. One and a half to two litres spread across the day is a sensible guideline for most adults, more in heat, during exercise or with dry heated air. Coffee and tea count towards this too, by the way, contrary to the old myth. Anyone who tends to forget to drink is best off keeping a bottle in sight or tying every short break to a sip of water. Drinking enough isn't a miracle cure, but it's the cheapest and most obvious measure of all — and it costs nothing but a little attention.

The relevant nutrients at a glance

Around eye health, there's a handful of nutrients for which approved claims exist in the EU, or which are traditionally associated with the eye. Important context: approved claims refer to the maintenance of normal vision — they're not a promise of healing for dry eyes, but describe general function.

Omega-3 fatty acids (EPA and DHA)

The long-chain omega-3 fatty acids from oily sea fish or microalgae are probably the most-discussed building block when it comes to the tear film. For docosahexaenoic acid, the approved claim states: Docosahexaenoic acid (DHA) contributes to the maintenance of normal vision. The beneficial effect is obtained with a daily intake of 250 mg DHA. Oily fish such as salmon, mackerel or herring once or twice a week is the classic source; for people who don't eat fish, algae oil products are a purely plant-based alternative that delivers DHA directly. Plant oils such as linseed or rapeseed oil do contain the short-chain alpha-linolenic acid, but the body converts only a small part of it into DHA — anyone specifically targeting DHA is on safer ground with fish or algae oil.

Vitamin A

Vitamin A is the classic among eye nutrients and a component of the visual process. Here the approved claim states: vitamin A contributes to the maintenance of normal vision. The body obtains it from animal sources such as liver, eggs and dairy products, as well as from beta-carotene in orange and dark green vegetables — carrots, sweet potatoes, kale and spinach. Vitamin A deficiency is rare in Germany; deliberately taking a high dose is neither necessary nor advisable.

Zinc and vitamin B2

Approved claims also exist for two further micronutrients: zinc contributes to the maintenance of normal vision and riboflavin contributes to the maintenance of normal vision. Zinc is found in meat, cheese, wholegrain products and pumpkin seeds, riboflavin (vitamin B2) in dairy products, eggs and green vegetables. A varied diet generally covers both well.

Lutein and zeaxanthin

These two plant pigments accumulate in the eye and are found in dark green leafy vegetables, corn and egg yolk. No approved health claim exists for them, but they're still part of a colourful, vegetable-rich diet. If you're interested in the background, we've covered the topic in detail in our guide on Lutein and Zeaxanthin for the Eyes.

Who this topic is especially relevant for

Dry eyes are far from an issue for older people only. Anyone who spends many hours at a monitor for work knows the feeling especially well by evening — here it's worth also checking our guide on Nutrients for Eyes at the Screen. Contact lens wearers, people in air-conditioned or heavily heated rooms, and women during or after menopause also report dryness more often. In all these cases, a solid nutrient foundation is a sensible building block — but just one alongside room climate, screen breaks and conscious blinking.

Diet-related or medical? An important distinction

Plain speaking is appropriate here: occasionally tired, dry eyes after a long day at the screen are something different from persistent, severe or suddenly appearing symptoms. A balanced diet can support general baseline supply — but it doesn't replace a diagnosis. If the dryness is persistent, impairs vision, comes with pain, redness or light sensitivity, or worsens rapidly, it needs an eye examination. Dry eyes can also have underlying causes that require treatment, and only a specialist can assess and treat that in a targeted way.

Intake, everyday life and quality

The most effective approach is unspectacular: diet first, then targeted supplementation. Two portions of oily fish a week, colourful vegetables daily, nuts and wholegrains — that usually lays the foundation for the nutrients mentioned. Anyone who doesn't eat fish, or wants to specifically target DHA, can choose an algae oil or fish oil product; the 250 mg of DHA per day is the guideline figure from the approved claim. Fat-soluble nutrients like vitamin A and omega-3 are best absorbed with a meal containing a little fat.

With food supplements, it's worth looking at quality: the origin and purity of the oil, a meaningful EPA and DHA content, and independent lab testing for contaminants and oxidation. A fresh, lightly oxidised oil can often be recognised by its neutral smell. Highly dosed single nutrients without a specific reason are best avoided — with micronutrients, more isn't automatically better, especially with vitamin A, which the body stores. In everyday life, small things often pay off: blink consciously, position the screen slightly below eye level, take regular short breaks to look into the distance, and don't run the heating at full blast. Anyone who's pregnant, takes medication long-term or has pre-existing conditions is best off discussing targeted supplementation with a doctor beforehand.

Honestly assessed: what's confirmed and what's not

It's confirmed that nutrients such as DHA, vitamin A, zinc and riboflavin contribute to the maintenance of normal vision — these are the claims vetted by the EU. Also plausible, and sensible in practice: adequate fluid and a balanced diet rich in vegetables and fish are a good foundation for eye health. Less clear-cut is how strongly individual products affect the feeling of dryness in a specific case — the evidence here is mixed, and individual causes play a large role. To stay honest: diet is a building block, not a cure. Anyone who follows the fundamentals day to day and involves an ophthalmologist for persistent symptoms is in the best position.

Frequently asked questions (FAQ)

Which nutrients are especially relevant for dry eyes?

Omega-3 fatty acids are at the forefront, above all DHA, for which the claim applies: docosahexaenoic acid contributes to the maintenance of normal vision. Vitamin A, zinc and riboflavin also play a supporting role, and approved claims for vision exist for these too. The most important factor remains a balanced overall diet with enough fluid.

Can I get rid of dry eyes through diet alone?

No. An eye-friendly diet supports general baseline supply, but it isn't a cure and doesn't replace a diagnosis. For persistent, severe or suddenly appearing symptoms, you should seek advice from an ophthalmologist, since underlying causes requiring treatment could be behind it.

How much omega-3 makes sense?

The approved claim cites 250 mg of DHA per day as the guideline for vision. This amount can be reached through oily fish once or twice a week, or through algae or fish oil products. Fat-soluble nutrients are best absorbed with a meal containing a little fat.

Does drinking more really help against dry eyes?

Drinking enough is the simplest lever, because the tear film consists largely of water. One and a half to two litres spread across the day is a good guideline, more with dry air or exercise. It's not a cure-all, but it's a sensible foundation.

Are food supplements necessary for the eyes?

With a balanced diet, most eye-relevant nutrients are well covered. Supplements can make sense if, for example, you don't eat fish and want to specifically target DHA. Look for quality and purity, and don't rely on unnecessarily high-dosed single nutrients.