If your eyes feel gritty, irritated, or tired by the end of the day, you are not imagining it. Dry eye is one of the most common reasons people visit an optometrist, and it has become significantly more prevalent in the past decade. The reasons are mostly things you would recognize from your own daily routine.
What is actually happening inside your eye
Your eye is covered by a thin film of tears. Not the crying kind. This tear film has three layers: an oily outer layer that prevents evaporation, a watery middle layer that nourishes and protects, and a mucus inner layer that helps tears spread evenly across the eye surface.
Dry eye happens when this system breaks down. Either your eyes do not produce enough tears, or the tears evaporate too quickly because the oily layer is not doing its job. The second type, called evaporative dry eye, accounts for roughly 85% of cases.
Most people assume dry eyes mean they are not making enough tears. In reality, the majority have a problem with tear quality, not tear quantity.
Why screens make it worse
When you stare at a screen, your blink rate drops dramatically. Normally, you blink about 15 to 20 times per minute. During screen use, that drops to about 5 to 7 times. Each blink spreads a fresh layer of tears across your eye, so fewer blinks means less coverage and more evaporation.
This is not just about phones. Laptops, monitors, tablets, even reading on an e-reader reduces your blink rate. And it is cumulative. Eight hours of screen time at work followed by scrolling in the evening is a lot of under-blinking.
Other common triggers
- Dry indoor air. Heating in winter and air conditioning in summer both pull moisture from the air and from your tear film.
- Contact lens wear. Lenses sit on the tear film and can disrupt its structure, especially toward the end of the day.
- Aging. Tear production naturally decreases with age, particularly after 50. Hormonal changes during menopause can accelerate this.
- Medications. Antihistamines, decongestants, blood pressure medications, and antidepressants can all reduce tear production.
- Wind and UV exposure. Spending time outdoors without proper eye protection dries out the tear film quickly.
What actually helps
There is a lot of advice floating around online, so here is what eye care professionals consistently recommend, ranked by how much impact it typically has.
The 20-20-20 rule
Every 20 minutes, look at something 20 feet away for 20 seconds. It sounds almost too simple, but it forces you to blink and gives your tear film a chance to recover. Set a timer if you need to. Most people forget without one.
Artificial tears (the right ones)
Over-the-counter lubricating drops can provide quick relief. Look for preservative-free options if you are using them more than four times a day, because the preservatives in regular drops can actually irritate your eyes with frequent use.
A note on "redness relief" drops: Products like Visine that promise to "get the red out" are not the same as lubricating drops. They work by constricting blood vessels and can cause rebound redness with regular use. Stick with plain artificial tears.
Warm compresses
A warm, damp washcloth held over your closed eyes for 5 to 10 minutes can help soften the oils in your meibomian glands. These are the tiny glands along your eyelid margin that produce the oily layer of your tear film. When they get clogged, your tears evaporate too fast.
Microwavable eye masks designed for this purpose maintain heat more evenly and for longer than a washcloth. They are inexpensive and worth trying if you deal with dry eyes regularly.
Environment changes
A humidifier in your bedroom or office can make a noticeable difference, especially during Alberta winters when indoor humidity can drop below 20%. Position your computer screen slightly below eye level so you are looking slightly downward, which reduces the amount of eye surface exposed to air.
When to see an optometrist
Occasional dryness after a long day is normal. But if your eyes are consistently uncomfortable, red, or sensitive to light, it is worth getting a proper assessment. An optometrist can evaluate your tear film quality, check your meibomian glands, and recommend treatments that go beyond over-the-counter drops.
In-office treatments like intense pulsed light (IPL) therapy and meibomian gland expression have become more common and can provide longer-lasting relief for moderate to severe cases.
The bottom line: dry eyes are very common, increasingly so in our screen-heavy world. But they are also very manageable once you understand what is driving them. Start with the simple habits, and talk to your eye care provider if they are not enough.