How much time do you spend on your tablet or mobile? Over a third of adults spend 4 to 6 hours a day on digital devices. Many people using these devices suffer from irritation, headaches, and fatigue. Eye fatigue has been associated with blue light emitted from modern digital devices. As light passes into the eye, the bluer light induces a greater range of focal points. This causes a reduction in image clarity and strain in the eye's focusing system. As a result, lens manufacturers have developed blue light control lenses. They are suitable for any age group and should be worn particularly during the evening.