Screens can genuinely trigger and worsen dry eye, but not for the reason most people think. It's almost certainly how my own dry eye started. Here's the honest science, and what genuinely helps.
My dry eye started when I was working full-time in an office, and I'm as sure as I can be that the concentrated screen work is what set it off. Eight hours a day of spreadsheets, typing, emailing, staring. It didn't take decades. It took less than a year.
So this one is personal. But it's also one of the most useful things to understand, because once you know why screens hurt your eyes, the things that help start to make a lot more sense.
Here's the bit almost nobody tells you. When you concentrate on a screen, two things happen to your blinking: you blink less often, and just as importantly, your blinks become incomplete. Your eyelids don't fully close, so they only do half the job.
The numbers are genuinely startling. Normally you blink around 15 to 20 times a minute, but the moment you're focused on a screen, that can drop to only 5 to 7 times a minute (one study found blink rates falling from about 22 a minute when relaxed to around 7 on a screen). And it's worse the more absorbing the task is, so something like gaming, where you're really locked in, can cut your blinking dramatically.
And blinking matters far more than it sounds. Every proper, full blink does two things: it spreads a fresh layer of tears across your eye, and it gently squeezes a little oil from the meibomian glands along your lash line, the oil that stops your tears evaporating too fast. So when you're not blinking often enough, or not blinking fully, your tear film dries out and destabilises between blinks. And over time, if those oil glands aren't being "pumped" regularly, they can get sluggish and clogged. That's a big part of how screen use can either trigger dry eye in the first place, or make existing dry eye a lot worse.
This isn't abstract for me. At my very first dry eye assessment, they filmed my blinks in slow motion and played them back, and you could clearly see that my eyelids weren't fully meeting when I blinked. So the oils weren't getting pushed out the way they should be. Seeing your own incomplete blink played back at you is a real "oh" moment.
The important thing to realise is that this isn't only about office jobs. It's anything you concentrate on: gaming, watching TV, scrolling your phone, bingeing a boxset. The more absorbed you are, the less you blink. So even your downtime can be quietly drying your eyes out. That was a horrible realisation for me, but it's better to know.
You'll see blue light blamed for everything, and blue-light-blocking glasses sold as the fix. So I looked into it properly, and I'm going to be straight with you: the evidence just isn't there.
A large Cochrane review of 17 clinical trials found that blue-light-filtering glasses probably make no difference to eye strain, eye health, or sleep, and there's no good evidence that blue light from screens damages your eyes or causes dry eye. The strain and dryness you feel from screens comes from your blinking and sustained focus, not from the colour of the light.
So I'm not going to tell you to buy blue-light glasses. If you already have a pair and like them, no harm done, but please don't spend money expecting them to fix your dry eye. They almost certainly won't. Your blinking is the thing to work on.
The good news is that the things that genuinely help are mostly free, and they're all about protecting your blinking and giving your eyes breaks.
And if your blinking has got lazy (mine had), the good news is you can retrain it. There are proper blinking exercises, and there's real research behind them: studies show they reduce incomplete blinks and improve how your oil glands work. The routine that came out best is simple, close, squeeze, open: close your eyes gently, squeeze them shut for a second or two, then open. Do 15 of those, three times a day. That little squeeze is what makes sure your lids fully meet and your glands actually get worked.
Screens didn't just tire my eyes out. I genuinely believe the concentrated screen work is what tipped me into dry eye disease. You can't always avoid screens, most of us can't. But once you understand it's about your blinking, the small habits (blinking fully, real breaks, dictation, drops) genuinely add up, and they cost far less than a drawer full of gadgets that don't work.
More reading: How I got diagnosed → · Flying with dry eye → · My tools for saving your eyes →