Como cuidar dos seus olhos enquanto trabalha de casa

How can screen time affect your eyes?

Dr Sarah Jarvis MBE acknowledges that the explosion in digital technology has brought many benefits - access to a wider selection of information, quicker communication, easier contact with far-flung family - but it has downsides too, with one of the biggest victims being your eyes.

She explains that visual fatigue or digital eye strain (DES) is common and affects anything from 1 in 2 to 3 in 4 computer users.

Os sintomas comuns incluem:

• Olhos secos.

• Tired eyes.

• Soreness or aching.

• Irritação nos olhos.

• Watering.

• Burning.

"Even an hour of digital use without a break can be enough to bring these symptoms on, but the longer you use your computer continuously, the worse symptoms tend to be," says Dr Jarvis.

How has working from home affected our eyes?

A poll surveyed 2,000 adults who were working from home. Results found 1 in 3 have eye strain complaints by the end of each day, despite 1 in 10 having three or more lights blazing in their home office space.

Several participants also admitted the room they primarily work in has 'limited' natural light.

Poor lighting can not only harm the health of your eyes, but also cause headaches, lethargy and irritability. In turn, this can negatively affect your motivation levels and productivity.

Physical discomfort and tiredness can also be a result of various lighting effects given off by inadequate light sources, such as 'glare'. This occurs when one part of the visual field is much brighter than the average brightness field.

'Veiling reflections' are also a common cause of problems in home offices, and occur when a window reflects light on to your screen, shielding the text. This can result in visual fatigue.

A major issue with working from home is how employees often struggle with setting boundaries and achieving a healthy work-life balance. Their eyes are then affected as they feel pressure to be constantly connected to their work in some way, spending more time staring at their computer.

15% said they never take a screen break, and overall, each day spend nearly eight hours directly gazing at either a computer monitor or their phone.

A handful of respondents even thought their eyesight has noticeably worsened as a result of working from home.

Not only that, but several participants reported that the pandemic has stopped them from visiting the optician when contacted for a check-up over the last 12 months.

What causes eye strain?

There are two main reasons for computer eye strain.

Blinking troubles

"Most of us blink without noticing, but if you've ever taken part in a staring contest, you'll know how quickly your eyes become uncomfortable. That's because the surface of your eye needs constant lubrication to remove tiny specks of dirt and prevent the surface of your eye from feeling dry.

"Your eyes constantly produce a film of tears to provide this lubrication, and blinking spreads it over the front surface of your eye. This tear film is constantly evaporating, so needs to be replaced. If your eyes are irritated, you'll naturally blink more - this helps wash away any irritants from the eye surface," says Dr Jarvis.

When you’re using a digital device, you tend to blink up to three times less often. This can lead to:

• Eye strain.

• Dores de cabeça.

• Visão embaçada.

• Olhos secos.

• Pain in the neck and shoulders.

"Reading for long periods can actually have the same effect, whether you're reading a book or from a tablet," Dr Jarvis shares.

Squinting to see

The second most common reason for eye strain while using a computer is if you have to squint to see properly.

Dr Jarvis says you might find yourself naturally squinting if your device isn't at the right distance away from your eyes, or if your eyesight hasn't been checked and corrected.

Squinting can allow you to focus better, and reduce glare from a bright screen. However, it creates hard work for the muscles around the eyes, meaning an unfortunate side effect is more eye strain.

How can you reduce computer eye strain?

The simplest, most obvious way to reduce your eye strain is to limit your screen time, or avoid digital technology altogether. However, this isn't realistic in today's society, especially when computers are a key aspect of many of our working lives.

However, Dr Jarvis offers a range of tips to minimise your risk of computer eye strain when using a computer, and to relieve symptoms.

• Use regular lubricant eye drops - these can be extremely effective at relieving symptoms. Using preservative-free drops specifically reduces the risk of irritation or intolerance, and can reduce evidence of inflammation in the tear film.

• See your optician for regular eye checks.

• If you're prescribed glasses or contact lenses, wear them!

• Keep your screen at the right distance from your eyes (about arm's length).

• Follow the '20-20-20 rule' - every 20 minutes, take a 20-second break and focus your eyes on something at least 20 feet away.

• Ideally, position your screen about 20 degrees below eye level - this means you'll be looking slightly down. This means your eyelids won't be fully open and will be covering (and protecting) more of the surface of your eyes.

• Try to get into the habit of blinking regularly.

• Consider a daily omega-3 fatty acid supplement (such as cod liver oil capsules) - while studies aren't conclusive, at least one study suggests they may improve the quality of tears, reducing evaporation and dry eye symptoms.

What else can cause tired eyes?

In order for your eyes to achieve optimum health, it's important to be aware of the factors that can cause issues.

Tired eyes can lead to soreness or aching, eye irritation, watering or burning. This in turn can lead to rubbing, followed by puffy skin or dark circles under the eyes.

As well as prolonged computer use, tired eyes can also be a result of:

• (Not) sleeping soundly - so many adults struggle with insomnia, which may be caused by mental health problems, stress, family issues and being in pain.

• A sensitive surface - Dr Jarvis explains how the surface of your eye has to be extremely thin and fragile to allow light through it. She says not blinking fully or often enough can prevent your tear film, which is required for lubrication, being spread over your eye surface effectively.

• Thin skin - with the skin on your eyelids being the thinnest in the body (sometimes only 0.2 mm thick), it's very delicate. This makes it prone to irritation and eczema or dermatitis which, in turn, can cause puffiness and soreness.

How can you relieve dry eyes?

In conjunction with reducing unnecessary screen time and practising good eye health while using a computer, there are other adaptations you can make to your lifestyle to relieve dry eyes.

Get better rest

"There's no easy solution to getting a better night's sleep. As a GP, I wish there were as it's one of the most common questions I'm asked about. Doctors very rarely recommend sleeping tablets, because of the health risks associated with them. But, that doesn't mean you have to resign yourself to poor sleep forever. Improving your 'sleep hygiene' can make a real difference," says Dr Jarvis.

Her tips for improving your sleep include:

• Try cutting out caffeine (either by switching completely to decaf, or by avoiding it for six hours before bedtime. Don't forget that tea, many colas and chocolate, as well as café, contain caffeine).

• Exercise regularly but avoid exercising in the evenings, as it can speed up your metabolic rate and make it hard to wind down.

• Make sure your bedroom is really quiet and dark.

• Remove ticking clocks and digital alarms which may tempt you to 'clock-watch'.

• Keep digital devices from the bedroom - there's good evidence that 'blue light' emitted from mobile phones and tablets can disrupt your sleep pattern.

• Avoid eating too late at night.

• Try to get into a regular sleeping routine - don't be tempted to sleep in if you've had a disturbed night's sleep.

• Avoid taking 'catnaps' during the day - these will leave you less tired at bedtime and can disrupt your body clock.

Warmth and relaxation

Dr Jarvis further suggests applying a warm compress or eye mask to help relieve puffiness, redness and tenderness.

"Taking time out to lie back with your eyes closed and light blocked out, while the warmth takes effect, can also be a useful way of relaxing, encouraging you to wind down before bed."