Dry and Irritated Eyes: Why They Happen and What Helps

Dry and irritated eyes are the most common reason people describe their eyes as uncomfortable, and the most misunderstood. It is not simply "not enough tears". It is usually an unstable tear film — too watery, too oily, or evaporating too fast — and that instability produces a cluster of symptoms including eye redness, eye discomfort, itching and, confusingly, watering.

The two kinds of dry eye

Water-deficient and evaporative, and most people have a mix of both. Aqueous-deficient dry eye means the lacrimal glands produce too little fluid. Evaporative dry eye means the oily meibomian glands along the lid margins are not delivering enough lipid, so the tear film breaks up between blinks.

Evaporative is far more common, and it is the one linked to screen work, contact lenses, air-conditioning, rosacea and ageing. The practical difference is in treatment: water-deficient dry eye responds to lubricants and punctal plugs, while evaporative dry eye often needs lid hygiene and warm compresses.

Symptoms, including the confusing ones

Itchy eyes, redness, grittiness and reflexive tearing can all come from the same tear-film problem. The watering is paradoxical but logical: an irritated ocular surface triggers reflex tear secretion, and those reflex tears have a composition that does not stabilise the film, so they run down the cheek while the eye still feels dry.

• Burning or stinging, especially in air-conditioning or wind
• Grittiness, as though something is in the eye
• Redness along the lid margin and white of the eye
• Fluctuating vision that clears on blinking
• Watering, particularly outdoors in cold wind
• Discomfort that worsens as the day goes on

What causes it

Age, screens, medications, environment, contact lenses and eyelid inflammation make up most of the list. The TFOS DEWS II epidemiology report identifies higher prevalence with age, female sex, certain autoimmune conditions, and modifiable factors including low humidity, pollution and reduced blink rate during screen use.

Medication is worth checking specifically. Antihistamines, decongestants, some antidepressants, isotretinoin and diuretics all reduce tear production or change tear composition. If dry eye started after a new prescription, the timing is the clue.

What helps, in order of evidence

Lubricants, lid care, environment and cause-specific treatment; supplements last.

1. Preservative-free lubricant drops. The mainstay. Preservative-free matters above four uses a day, because benzalkonium chloride irritates the surface with repeated exposure.
2. Warm compresses and lid hygiene. Ten minutes of warmth then gentle lid massage, daily at first, is first-line for meibomian gland dysfunction.
3. Environmental changes. Humidity, avoiding direct air currents, breaks from screens, and never sleeping in contact lenses.
4. Omega-3 supplementation. Mixed trial results: the DREAM study found no significant benefit over placebo, while some earlier trials were positive. Worth discussing rather than assuming.
5. Clinical options. Punctal plugs, prescription anti-inflammatory drops, IPL for meibomian glands, and treatment of underlying disease.

When it is allergy rather than dryness

Itching is the giveaway. Dryness causes burning and grittiness; allergy causes itch, and itch is the symptom that most reliably points to histamine. Seasonal patterns, swollen lids and a response to antihistamines confirm it. Both can coexist, and antihistamine tablets can worsen dryness as a side effect — one of the more annoying loops in this area.

When to see someone

One rule of thumb before you buy anything: eye discomfort that behaves like dryness usually responds to drops and lid care, whereas itchy eyes and eye redness concentrated along the lid margins point to allergy or blepharitis and need different treatment.

If symptoms persist beyond a few weeks of lubricants and lid care, or if vision is affected, get assessed. Also be seen promptly for eye pain with redness, a foreign-body sensation that does not settle, or any sudden change in vision. Severe dry eye is a legitimate medical condition that can damage the corneal surface over time.