Digital Eye Strain: What Is Really Going On, and What Actually Helps

Most weeks, someone sits down in my testing room, rubs their eyes and says some version of the same thing. My eyes feel tired all the time, and I think it is my screen. They are usually right that something is going on. They are often wrong about what it is, and about what will fix it.

I am Rupal, the optometrist here at Perspective in Belsize Park. Digital eye strain is one of the most common reasons people come to see me, and there is a great deal of confusing advice about it, some of it sold rather than explained. So here is an honest walk-through of what digital eye strain actually is, what tends to cause it, and the things that genuinely help.

What digital eye strain actually is

Digital eye strain, sometimes called computer vision syndrome, is the cluster of symptoms that builds up after long stretches of screen time. It is real, and it is uncomfortable, but it helps to know that it is a strain response rather than damage to your eyes.

The usual signs are tired, aching eyes, headaches that creep in across the afternoon, blurred vision when you look up from your screen, and dry or gritty eyes. Many people also notice their neck and shoulders tightening, because we tend to hold ourselves stiffly when we are concentrating on a display.

The reassuring part is that these symptoms almost always settle once the underlying cause is dealt with. The frustrating part is that the cause is not always the screen itself.

Why screens leave your eyes feeling so tired

A few things tend to be happening at once.

First, you blink far less when you stare at a screen. Normal blinking spreads a fresh layer of tears across the surface of your eye. Cut that rate down for hours at a time, and the surface dries out, which is why so much screen-related discomfort is really a tear film problem.

Second, your eyes are holding focus at a close distance for a long time. The small muscles that do that focusing simply get fatigued, in the same way your legs would after standing still for hours.

Third, and this is the one people least expect, a small or out-of-date prescription makes everything harder. If your eyes are working overtime just to keep the screen sharp, strain arrives much faster. I saw exactly this not long ago. A graphic designer came in, certain she needed special screen glasses, because her eyes ached by the middle of every afternoon. 

Her prescription had drifted only slightly since her last test, but her eyes had been quietly straining to make up the difference for the best part of two years. We updated it, added nothing fancy, and a fortnight later she told me the afternoon ache had simply gone. A thorough eye examination is the only reliable way to know whether that is you too.

Finally, your setup matters. Glare bouncing off your screen, harsh overhead lighting and a monitor placed too high or too close all add to the load.

The honest truth about blue light glasses

This is where I have to be straight with you, because it is the question I am asked more than any other.

Blue light glasses are marketed very heavily as the answer to screen fatigue. The evidence does not really back that up. A major review of the research by Cochrane, which pools the best available studies, found that blue light filtering lenses probably make no meaningful difference to eye strain, eye health or sleep. The College of Optometrists, the professional body that sets the standards I work to, goes further and advises optometrists to tell patients plainly that there is no strong evidence these lenses ease eye fatigue, improve sleep or protect the back of the eye.

There is a simple reason behind this. The amount of blue light coming off your phone or laptop is tiny next to what you get from ordinary daylight. Filtering a little more of it out was never likely to transform how your eyes feel.

I am not telling you this to be awkward. I am telling you because you deserve to know where your money is best spent. If a blue light coating genuinely makes you feel more comfortable, I am happy to add it. What I will not do is promise it will cure your eye strain, because the science does not support that, and selling someone something on a false promise is not how we work here.

Not sure whether your tired eyes come down to your screen, your prescription or a dry eye problem? That is exactly the sort of thing we untangle together. Our appointments run for a full 45 minutes, so there is time to get to the bottom of it rather than guess. Book an appointment whenever it suits you.

What genuinely helps with digital eye strain

Here is where the good news sits, because plenty does work.

Start with the right prescription. For a lot of people, an accurate, up-to-date prescription is the single biggest improvement they can make. If you need correction for screen distance in particular, the right prescription glasses make hours at a desk feel effortless.

Add an anti-reflective coating. Unlike blue light filters, this one has a clear job and does it well. It cuts the reflections and glare coming off your lenses and your screen, so your eyes are not fighting distracting bright spots all day. We can add it to any of our lenses.

Ask about dedicated office lenses. If you spend most of your working day on screens, these are worth knowing about. They give you a wider, more comfortable zone of focus for the intermediate distances you use at a desk, which is something standard varifocals are not designed for. We fit the Seiko range, which includes lenses built specifically for digital and indoor use.

Look after your tear film. If dryness is a big part of your discomfort, the answer is usually managing the dry eye directly rather than reaching for screen glasses. That might be as simple as the right drops, or it might be worth a proper assessment if it keeps coming back.

Mind your lenses if you wear contacts. For contact lens wearers, dryness on screens is especially common, and sometimes a change of lens or routine makes a real difference.

Use the free habits because they matter most. Every 20 minutes or so, look at something across the room for around 20 seconds to let your focusing muscles relax. Make a conscious effort to blink fully. Position your screen a little below eye level and about an arm’s length away, and soften any harsh glare in the room. None of this costs a penny, and together it adds up.

When tired eyes are worth getting checked

Most digital eye strain is harmless and easily sorted. Now and then, though, the same symptoms can point to something that deserves attention, such as an undiagnosed focusing or alignment issue, or occasionally an eye health condition picked up during a routine examination. 

Persistent headaches, vision that will not clear, or one eye that feels different from the other are all good reasons to come in. A full eye examination checks the health of your eyes as well as your vision, so nothing is missed.

It is worth a word on children, too. With so much of school and downtime now happening on screens, parents often ask whether all that screen time is harming their child’s eyes. The honest answer is that screens cause the same temporary strain in children as in adults. The more important reason to bring them in is to catch developing vision problems early, while they are easiest to manage. Children’s eye examinations are a particular focus of mine.

Common questions about digital eye strain

Do blue light glasses really work?

The honest answer is that the evidence does not support the bigger claims. The best available research, gathered by Cochrane, found that blue light filtering lenses probably make no real difference to eye strain, sleep or eye health. If a coating makes you feel more comfortable, we are glad to add it, but it is not a cure for screen fatigue, and we will not sell it to you as one.

Are screens bad for my child’s eyes?

Screens cause the same temporary strain in children as in adults, rather than lasting damage. The more important reason to bring children in is to pick up developing vision problems early, while they are easiest to manage. If your child rubs their eyes, sits very close to screens or complains of headaches, it is worth a check.

How often should I rest my eyes when working on a screen?

A simple habit helps more than any product. Every 20 minutes or so, look at something across the room, roughly 20 feet away, for about 20 seconds. It gives your focusing muscles a moment to relax, and it costs nothing.

What is the difference between blue light glasses and office lenses?

They are not the same thing. Blue light coatings filter a little light and have limited evidence behind them. Office lenses, sometimes called computer lenses, are a genuinely different prescription design that gives you a wider, more comfortable field of focus at desk distances.

For someone on screens all day, the second is usually far more useful.

Come and see us in Belsize Park

If your eyes are tired of your screen, you do not have to put up with it, and you certainly do not have to spend money on a fix that does not work. We will work out what is actually causing your strain and sort it properly, with a cup of tea while we are at it. You can book an appointment online or call us on 020 7586 5508.

Rupal Shah is the optometrist at Perspective Optometrists in Belsize Park, holding a Postgraduate Diploma in Clinical Optometry with Distinction and a postgraduate qualification in Paediatric Optometry.