blue light

blue light is a type of visible light with short, high-energy waves. its wavelength ranges from approximately 380 nanometers (violet light) to 700 nanometers (red light). blue light waves are only slightly longer and less powerful than ultraviolet (UV) waves, which are invisible to the naked eye.

blue light is encountered from various sources, including the sun, fluorescent bulbs, incandescent lights and digital screens.

when sunlight enters the atmosphere, blue light waves scatter off nitrogen and oxygen particles. these particles are perfectly suited to deflect blue light, giving the sky its characteristic blue hue. during sunset, the longer path of sunlight allows more blue light to dissipate, revealing the warm red and gold tones we associate with a gorgeous sunset.

blue light penetrates our eyes and reaches the retina at the back of the eye. while the cornea and lens protect us from harmful UV rays, they don't block out blue light. approximately one-third of visible light is considered high-energy visible (HEV) or blue light. some experts believe that prolonged exposure to blue light from screens may contribute to digital eyestrain and affect our sleep cycles.

blue light exposure during the day helps to regulate our circadian rhythm, keeping us alert and awake.

excessive blue light exposure, especially at night, can interfere with sleep patterns. some studies suggest that chronic exposure to blue light may contribute to macular degeneration (a condition affecting central vision). however, conclusive evidence is still lacking.

to reduce blue light exposure, : ̗̀➛ use blue light filters on screens or wear blue light-blocking glasses : ̗̀➛ limit screen time before bedtime : ̗̀➛ consider using warm-toned lighting in the evening

for further exploration on the topic of blue light: healthline sleep foundation all about vision vision centre web md