Parents often complain about the exceeding amount of time their children spend glued to smartphones, tablets and other digital devices, but most parents are unaware of the actual impact of digital devices on vision. A recent survey by VSP Vision Care in the U.S. has revealed that nearly 60 percent of parents have little or no awareness of blue light - the high-energy light emitted from digital devices – and its impact on vision and overall health. The survey has also revealed that by the time the average American child reaches the age of 17, their eyes will have spent the equivalent of nearly six years looking at digital devices. Almost half of parents said they try to impose limits on children's daily device usage but they also said those rules are difficult to enforce.