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According to Professor Dan Reinstein, medical director and specialist laser eye surgeon at the London Vision Clinic, around 30 per cent of people in the UK experience dry eyes at some point in their lives.
Your tears are a complex mixture of water, fatty oils and mucus. This mixture helps make the surface of your eyes smooth and clear, and it helps protect your eyes from infection.
Dry eyes are relatively common and occur when your tears can't provide enough lubrication for your eyes: typical, for example if you forget to blink when concentrating on your work or computer screen.
For some people, the cause of dry eyes is decreased tear production. For others, it's increased tear evaporation and an imbalance in the makeup of your tears.
But the condition can also be caused by several health problems which reduce the number of tears produced, such as diabetes, thyroid disorders or rheumatoid arthritis; by some medications, including antihistamines, HRT and those to treat high blood pressure; laser eye surgery and ageing.
In addition, factors such as dry air, wind and smoke contribute to an increase in tear evaporation.
Dry eyes can cause the eyes to feel:
"For most people with occasional or mild dry eye symptoms, the standard treatment for dry eyes involves lubricating drops known as 'artificial tears'", says Dr Sarah Brewer.
If your symptoms are persistent and more serious however, you may want to address the underlying problem to prevent further damage to your eye. Though the severest causes may require surgery, there are some simple things you can do to help reduce symptoms.
Professor Reinstein advises washing your eyes every day. "Use the shampoo you would use when washing your hair in the shower, close your eyes and use your fingers to rub your eyelashes. Do it as part of your personal hygiene routine," he says. "The shampoo will clear excess oil from the glands around your eyes, keeping them clean and healthy."
While, as a more natural remedy, "increasing your intake of oily fish, or taking an omega 3 fish oil supplement may help", suggests Dr Sarah. This is because the tear film has three basic layers: oil, water and mucus. Problems with any of these layers can cause dry eyes.
Nothing beats a healthy, balanced diet to provide all the nutrients we need. But when this isn't possible, supplements can help. This article isn't intended to replace medical advice. Please consult your healthcare professional before trying supplements or herbal medicines.