Your eyes blink about 15 times a minute under normal conditions. When you stare at a screen, that drops to 5 to 7 times. Over the course of an eight-hour workday, that adds up to thousands of blinks your eyes did not get — thousands of moments the tear film was not refreshed, the cornea was not protected, and the surface of the eye was left exposed.

Dry eye syndrome has become one of the most common conditions in ophthalmology, and the explosion of screen-based work and entertainment over the past decade has accelerated it dramatically. If your eyes feel gritty, tired, burning, or strangely watery by the end of the day, this article explains what is happening and what can be done about it.

What Is Dry Eye Syndrome?

The surface of the eye is covered by a thin, complex tear film that serves several vital functions: it keeps the cornea smooth and optically clear, provides oxygen and nutrients, washes away debris, and protects against infection. When this tear film is insufficient in quantity, unstable in quality, or evaporates too quickly, the result is dry eye — a chronic condition that causes discomfort, visual disturbance, and, if left untreated, damage to the corneal surface.

There are two main types. Aqueous-deficient dry eye occurs when the lacrimal glands do not produce enough tears. Evaporative dry eye — by far the more common form — occurs when the oily outer layer of the tear film is deficient, usually due to dysfunction of the meibomian glands in the eyelids. Without this oil layer, tears evaporate far too quickly. Many patients have a combination of both.

Why Screens Make It Worse

Digital screens are not inherently toxic to the eyes. The problem is what happens to our blink reflex when we concentrate on them. Focused screen work suppresses the blink rate by 50% to 66%. Each blink spreads a fresh layer of tears across the cornea. Fewer blinks mean less tear replenishment, more evaporation, and a progressively drier, more inflamed ocular surface.

This is compounded by environmental factors that are common in offices and homes during winter: air conditioning, heating systems, low humidity, and ceiling fans — all of which accelerate tear evaporation. In KwaZulu-Natal’s dry winter months, these factors combine with screen use to create a perfect storm for dry eye symptoms.

The Symptoms to Recognise

Dry eye can present in many ways, and the symptoms are sometimes misleading. The classic signs include:

• A burning, stinging, or gritty sensation
• Redness
• Light sensitivity
• Fluctuating vision that clears momentarily after blinking
• A feeling of heaviness or tiredness in the eyes
• Stringy mucus in or around the eyes
• Difficulty wearing contact lenses comfortably

One of the most counterintuitive symptoms is watery eyes. When the corneal surface becomes too dry, the lacrimal gland produces a flood of reflex tears in response. These emergency tears are watery and lack the oily stabilising layer, so they do not solve the underlying problem. Patients with paradoxically watery eyes often do not realise they have dry eye — they assume the opposite.

Who Is Most at Risk?

Dry eye is more common in women than men, particularly during and after menopause. Age is a significant factor — tear production naturally declines over time. Contact lens wearers are significantly more susceptible. Certain medications increase risk, including antihistamines, antidepressants, blood pressure medications, and oral contraceptives. Autoimmune conditions such as Sjogren’s syndrome, rheumatoid arthritis, and lupus are strongly associated with dry eye. And anyone who spends more than four hours a day on screens — which today includes most working adults and many children — is at increased risk.

The 20-20-20 Rule

The simplest and most effective screen habit for your eyes takes 20 seconds and costs nothing. Every 20 minutes, look at something at least 20 feet (6 metres) away for at least 20 seconds. This breaks the concentrated stare cycle, resets the blink rate, and gives the tear film a chance to recover. It is not a cure for established dry eye, but it is a powerful preventive measure — and virtually no one does it consistently.

Treatment Options

Dry eye is a chronic condition, and treatment is about management rather than a one-time fix. The approach depends on the type and severity.

For mild cases, preservative-free artificial tears used several times a day provide immediate relief and surface protection. Warm compresses and gentle lid massage help restore meibomian gland function in evaporative dry eye. Omega-3 supplementation — from fish oil or flaxseed — has evidence supporting its role in improving tear quality.

For moderate to severe cases, prescription anti-inflammatory drops such as Cyclosporin A (most notably known by the brand name Restasis) targets the underlying inflammation that drives chronic dry eye. Punctal plugs — tiny silicone inserts placed in the tear drainage ducts — help retain tears on the eye surface for longer. In severe or refractory cases, serum tears (made from the patient’s own blood) or intense pulsed light (IPL) therapy may be recommended.

The key is accurate diagnosis. Not all dry eyes are the same, and the wrong treatment for the wrong type provides little benefit. A comprehensive dry eye assessment with an ophthalmologist identifies the specific cause and guides the most effective treatment plan.

When to See a Specialist

If your symptoms have persisted for more than a few weeks, are affecting your ability to work or read comfortably, or are not adequately controlled by over-the-counter drops, a specialist assessment is worthwhile. Persistent dry eye left untreated can lead to corneal damage, increased infection risk, and a significant impact on quality of life.