What is Blue Light ?
Blue light is the high energy & strongest portion of the visible light. Due to its short wave length, its frequency is very high. Size of this portion is usually around 380- 500 nanometers. High frequency translates into high radiation. Human eyes find it difficult to tolerate the blue light. This 
portion of the light flickers more than weaker portion and this is one of the reasons why we experience headache, eye fatigue, blurry vision etc when our eyes are exposed in blue light.
Goes deeper than UV rays
Spectacle buyers in India have a common perception that UV rays are the most harmful rays. In the era of computer & mobile phones, they should be more concerned about blue
light than UV rays. Science says that blue light has more penetration power and this easily reaches the back of the eye to the nerves. This causes many problems like eye fatigue, loss of vision, blurry vision etc.
Badly affects sleep patterns
While sleeping at night, a hormone called Melatonin starts secreting inside the brain from pineal gland. This sleep-hormone is mainly responsible for controlling the sleep
patterns. Lesser production of this hormone causes sleep disorder and high production may cause too much laziness. Blue light exposure may result inobstruction of this natural phenomenon.
Digital screens emit lots of blue light
Devices with digital screens likesmartphones, laptop, computer etc produce largeamount of blue light that is harmful for your eyes. As per a study Smartphones tops in the list of blue light producing devices. In a technological driven society, it is needless to say that exposure to the blue light has risen dramatically.