Using digital technology (such as smartphones, e-readers and tablets) demands a lot from our eyes. We look at them more closely than we would, say, a book. At the same time, in just a fraction of a second our eyes move from close up to far away: from the small screens – with their tiny text, tightly packed information – and back again. This places extreme strain on the ciliary muscle and the eye’s lens, which must constantly re-adapt to different distances to ensure that what we see is in focus. The strain on the ciliary muscles results in symptoms such as headaches (usually on the front or sides of the head), sore and tired eyes, and blurred vision. These symptoms may not always be there, they tend to be felt more towards the end of the day.