Watery eyes: why 'too wet' often means 'too dry'

How the tear system should work

Tears are produced continuously by the tear gland above the eye, spread with every blink, and drained via two tiny openings in the inner corner (top and bottom) that lead through small ducts into the nose. That is why crying gives you a runny nose. Overflow happens when supply exceeds drainage — and the imbalance can sit on either side.

The paradox: dry eye, wet cheek

The most common cause of watery eyes in adults is an unstable tear film — dry eyes, in other words. Sounds contradictory, works like this: when the basic tear film evaporates too fast or is of poor quality (often due to faltering oil glands in the lid margins), the ocular surface becomes irritated. That irritation triggers the tear gland into reflex tearing: a wave of thin, watery tears that swamps the drainage. Result: overflowing eyes — with dryness as the underlying problem.

The clues for this route: watering in bursts with wind, cold, light or concentrated viewing, combined with burning or grittiness at other times. The treatment is counter-intuitive but logical: improve the tear film with artificial tears and lid margin hygiene (warm compresses, cleaning the margins). Remove the irritation and the emergency production switches off.

When drainage falters

The second route sits on the drainage side. The tear openings can narrow or tilt slightly outward (no longer 'touching' the tear film), and the ducts or tear sac can narrow or block — sometimes after infections, more often simply with age. Characteristic: an almost continuously wet eye, indoors too, without triggers, sometimes with mucous discharge or pressure at the side of the nose. Recurring tear sac infection (a painful red swelling beside the nose) belongs to this category and deserves treatment.

Targeted examination settles it: an ophthalmologist can flush the tear passages and image them if needed. Solutions range from dilating a narrow tear opening to tear duct surgery (dacryocystorhinostomy), creating a new drainage route into the nose — a procedure with high success rates when properly indicated.

Lid position and blink power

The third factor is the lid itself. With age the lower lid can slacken and sag outward (ectropion) or tip inward (entropion, lashes brushing the eye). Either way the tear transport falters: the blink no longer sweeps the tear film neatly towards the drainage points. A weakened facial nerve (after facial palsy, for instance) disturbs this pump as well. A minor lid correction here often restores both comfort and drainage.

Watery eyes in babies

In infants the cause is usually innocent: the membrane at the bottom of the tear duct has not yet opened at birth, so the eye waters and sticks easily. In the great majority the duct opens spontaneously within the first year; gentle massage of the tear sac (towards the nose) helps it along. If the eye turns red, produces pus, or keeps watering after the first year, a GP or ophthalmologist takes a look — simple probing can then open the duct.