Why do my eyes burn and water by evening? Understanding dry eye

This is one of the most common complaints in an eye clinic, usually from someone in their twenties or thirties who works in front of a screen: eyes that are fine in the morning, but by evening burn, feel gritty and, strangely, keep watering. The watering confuses people the most. How can a dry eye water?

The answer is that this is dry eye disease, and it is very common in working-age adults.

What is going wrong

The surface of your eye is kept comfortable by the tear film, a very thin, three-layered coating. There is a watery layer that does most of the wetting, a mucous layer that helps it stick to the eye, and, on the outside, a fine layer of oil produced by tiny glands in your eyelids. The oil is what stops your tears evaporating too quickly.

Dry eye happens in two broad ways. In aqueous-deficient dry eye, the eye does not produce enough of the watery layer. In evaporative dry eye, which is more common, the tears are produced but evaporate too fast, usually because those oil glands in the lids are blocked or sluggish.

And the paradoxical watering? When the surface of the eye becomes dry and irritated, it sends an alarm signal, and the eye responds with a flood of reflex tears. These are poor-quality, watery tears that spill over your lids without fixing the dryness. So yes, a dry eye can be a watery eye.

Why screens make it worse

When you concentrate on a screen, your blink rate drops sharply. A normal blink spreads a fresh coat of tears across the eye. Stare at a spreadsheet or a phone for hours, blinking rarely and often incompletely, and the tear film breaks up and dries in patches. That is why symptoms build through the working day and peak by evening.

The Hyderabad factor

Living and working in this city adds its own load. Most offices are air-conditioned, and AC air is dry air; it pulls moisture off the eye surface hour after hour. Then there is the commute. If you ride a two-wheeler, wind and dust hit your open eyes twice a day. Add construction dust, traffic fumes and long summers, and it is no surprise that dry eye is so common here. Keeping the visor down or wearing protective glasses on the bike reduces that exposure.

What helps at home

Before any prescription, there are simple things to try:

• The 20-20-20 rule. Every 20 minutes, look at something about 20 feet away for 20 seconds, and blink fully a few times. Set a reminder if you must; nobody remembers on their own.
• Warm compresses. A clean cloth soaked in comfortably warm water, held over closed lids for five minutes daily, softens the blocked oil in the lid glands so it can flow again. This addresses the commonest cause.
• Preservative-free lubricating drops. These can be used several times a day. Preservative-free matters, because the preservatives in some bottled drops can themselves irritate the eye surface with long-term frequent use.
• Sensible habits. Point the AC vent away from your face, keep the screen slightly below eye level, and drink enough water.

If you wear contact lenses, dryness changes the equation a little; lenses sit on the tear film and can worsen symptoms, so it is worth having your fit and wearing habits reviewed by your eye-care professional.

When you should see an eye doctor

See an eye doctor if the burning and watering are persistent despite these measures, if your vision blurs and clears with blinking, if light bothers you, or if the eyes are red day after day. These signs suggest the surface of the eye is affected, and there are treatments beyond plain drops, such as care of the lid glands and anti-inflammatory therapy where needed.

Dry eye is also occasionally the first sign of something systemic, and severe dryness deserves a full eye examination, not years of self-treatment with whatever drops the pharmacy suggests.

Dry eye can usually be managed once it is clear which kind you have and why.