The simple answer is: just about everywhere!

Sources of blue light include sunshine, digital screens (TVs, computers, laptops, smart phones and tablets), electronic devices, and fluorescent and LED lighting.


Natural blue light vs artificial blue light

In its natural form, your body uses blue light from the sun to regulate your natural sleep and wake cycles – this is known as your circadian rhythm. Blue light also helps boost alertness, heighten reaction times, elevate moods, and increase the feeling of well being. Artificial sources of blue light include electronic / digital devices like smartphones, laptops, desktop computers and TVs, as well as ‘energy-efficient’ fluorescent bulbs and LED lights.


Why should we be concerned about blue light exposure?

Blue light waves are the among the shortest, highest energy wavelengths in the visible light spectrum. Because they are shorter, these ‘Blue’ or High Energy Visible (HEV) wavelengths flicker more easily than longer, weaker wavelengths. This kind of flickering creates a glare that can reduce visual contrast and affect sharpness and clarity.

This flickering and glaring is one of the reasons for eyestrain, headaches, physical and mental fatigue caused by many hours sitting in front of a computer screen or other electronic devices.

Our eyes’ natural filters do not provide sufficient protection against blue light rays these devices or from blue light emitted from fluorescent light tubes. Research has shown that prolonged exposure to blue light may cause retinal damage and contribute to degenerative changes in the macular, which can eventually lead to loss of vision.