What are the harms and benefits of blue light?

Blue light exists everywhere in our lives
So what are the harms and benefits of blue light?

Harm 1
Blue light is one of the causes of digital eye fatigue
Short wavelength, high-energy blue light is more prone to scattering and difficult to focus than other visible light.
When you look at computer screens and other digital devices that emit a lot of blue light, this unfocused visual "noise" reduces contrast and may lead to digital eye fatigue.

Harm 2
Long term accumulation of blue light may increase the risk of retinal diseases
Age related macular degeneration (AMD) is the main cause of blindness in middle-aged and elderly people, and the incidence rate increases with age.
The cause has not been determined yet, and related risk factors include age, gender, race, genetics, smoking, obesity, hyperlipidemia, photodamage, metabolism, and nutrition.

Harm 3
Long term accumulation of blue light also increases the risk of systemic diseases associated with circadian rhythms
Blue light affects the secretion of melatonin and affects the circadian rhythm. The disorder of circadian rhythm is extremely harmful to human health and will increase the risk of obesity, diabetes, heart disease and cancer.

Benefit

Help improve emotions
Preventing myopia in children and affecting nighttime vision
Help improve emotions, enhance memory and cognition

Modern lifestyle makes blue light ubiquitous, so how should we protect our eyes in our daily lives
How to prevent damage caused by blue light?

Anti blue light lens
Two common lens anti blue light technologies
1. By reflecting blue light on the front surface of the lens, there will be a blue purple reflection on the surface of the lens
2. The lens material absorbs blue light, so the lens usually appears light yellow

Lens solutions need to avoid two major misconceptions
Block harmful blue light
Block UV from passing through beneficial blue light

Places that should be guarded against are not guarded against
Due to incorrect protection, color cast may occur, causing discomfort to the eyes. Yellow anti blue light lenses increase visual fatigue by 10% -20% compared to colorless lenses

Lighting lamps:
Use qualified LEDs
Attention should be paid to choosing products with low blue light hazard levels and close to natural light for household lighting, desk lights, etc.
Referring to the IEC62471 EU standard, choosing both Class 0 and Class 1 products is safe. Simply put, LED lights from reputable brands on the market are compliant with the standard and safe.

Reduce eye time
The American Academy of Ophthalmology (AAO) advocates the use of the "20-20-20" principle to reduce eye time.
20-20-20 "means that every 20 minutes of looking at an electronic product, the eyes are allowed to look 20 feet (equivalent to 6 meters) away for approximately 20 seconds.

Effective protection for electronic devices
If you frequently use your phone, tablet, or computer, you can consider applying a blue light filtering film to the screen.