Eye problems can also develop due to the use of dirty contact lenses. During regular use, bacteria and grime develops on the front and back of contact lenses.

The number of people suffering infections due to regular lens wearing is low, with experts at the Brien Holden Institute finding that about 4 out of 20,000 daily contact lens wearers develop an eye infection every year.

Yet the effects of infections can be severe. Infectious diseases like conjunctivitis can cause intense discomfort, but more serious conditions can lead to blindness.

Eye experts recommend that lens wearers use contact lens solutions recommended by their opticians to disinfect their lenses after using them. And although many cleaning solutions are labelled as "no rub" products, experts also think that rubbing the lenses while washing can remove even more dirt and bacteria.

Another thing that many contact lens wearers forget to think about is how their lenses are stored. Contact lens cases can be a source of infection as well, and it is sensible to disinfect your lens cases regularly, and replace it after around 3 months of use.

It is also very important to use properly concentrated lens cleaning solution. Don't just top up yesterday's solution. Doing so reduces the effectiveness of cleaning products and raises the risk of infection.

How safe are contact lenses?