Dry Eye: when tears aren’t enough

Dry eye is a condition in which the tear film — the thin layer of tears that coats and protects the surface of the eye — becomes scarce or unstable and can no longer perform its job. Tears aren’t just for crying: they form the eye’s first optical surface and provide it with nourishment and defense. When they are lacking, seeing is like taking a photograph through a lens that is smudged, scratched, and dusty: the image loses sharpness, and the eye demands attention.

The condition is far more widespread than people think, affecting, roughly speaking, up to 20-30% of the adult population, with a clear predominance in women after menopause and in people who spend many hours in front of screens. It is not a minor annoyance: it is a genuine disease of the ocular surface, now well recognized and treatable.

Dry eye presents with redness, burning, and a gritty sensation.

It’s not always about quantity

Broadly speaking, dry eye has two underlying mechanisms. In the first, there are too few tears, because the glands produce an insufficient amount. In the second, much more common mechanism, tears evaporate too quickly due to dysfunction of the meibomian glands — the small glands along the eyelid margin that produce the oily component of the tear film, the part that slows its evaporation. This is why, paradoxically, even an eye that “waters a lot” can be a dry eye: it produces poor-quality tears that don’t stay on the surface.

Symptoms not to underestimate

Typically, the patient reports burning, a foreign-body or gritty sensation, tired eyes, light sensitivity, and vision that blurs intermittently and improves with blinking. Interestingly, excessive tearing can also be a warning sign: it is the eye’s reflex response to irritation. Symptoms typically worsen in the evening, in dry or windy environments, in a car with air conditioning, and after many hours at the computer, when blink frequency drops.

Fluorescein staining highlights the affected areas of the ocular surface.

How it is assessed

Diagnosis begins with a thorough examination of the ocular surface. The eye doctor measures the BUT (break-up time), the time it takes for the tear film to break up, assesses tear quantity, and examines the surface using dyes that highlight affected areas. Analysis of the meibomian glands completes the picture and guides treatment, because treating dry eye without understanding its mechanism means proceeding blindly.

Solutions

The foundation of treatment is tear substitutes — artificial tears based on hyaluronic acid or methylcellulose — which replenish and stabilize the tear film. When the problem is evaporative, eyelid hygiene, warm compresses, and pulsed light therapy, which reactivates the meibomian glands, are helpful. In more significant cases, punctal plugs — tiny plugs that slow tear drainage — or specific eye drops may be used. Alongside treatment, good habits matter a great deal: blinking consciously, humidifying rooms, and taking breaks from screens.

In conclusion

Dry eye is a chronic condition that rarely “heals” on its own, but which today can be managed very well once its cause is precisely identified. This is why, when facing discomfort that keeps recurring day after day, the most useful step is not to switch over-the-counter eye drops week after week, but to see an eye doctor who can restore stability to the tear film — and comfort to the eye.