Biological effects of high-energy visible light

High-energy visible light (HEV light) is a portion of the electromagnetic spectrum that is visible to the human eye. It is characterized by shorter wavelengths and higher energy than other visible light, and is often associated with potential biological effects.

Definition

HEV light is defined as light in the wavelength range of 400 to 450 nanometers. This range is part of the overall visible light spectrum, which extends from approximately 380 to 750 nanometers. The term "high-energy" refers to the fact that light at shorter wavelengths carries more energy than light at longer wavelengths.

Sources of HEV Light

HEV light is emitted by the sun, but it is also produced by artificial sources such as fluorescent lighting and LED lighting. In recent years, there has been increasing concern about exposure to HEV light from electronic devices such as computer monitors, smartphones, and television screens.

Biological Effects

The biological effects of HEV light are a topic of ongoing research. Some studies suggest that prolonged exposure to HEV light may contribute to age-related macular degeneration (AMD), a leading cause of blindness in older adults. Other research indicates that HEV light can disrupt the body's circadian rhythm, potentially leading to sleep disorders and other health problems.

Eye Health

The eye is particularly susceptible to the effects of HEV light. The cornea and lens of the eye are unable to block or filter out HEV light, allowing it to reach the retina. Over time, this can cause damage to the retina and contribute to the development of AMD.

Circadian Rhythm

HEV light plays a key role in regulating the body's circadian rhythm. Exposure to HEV light during the day helps to maintain alertness and cognitive performance. However, exposure to HEV light in the evening can delay the onset of sleep and disrupt the sleep-wake cycle.

Protection Against HEV Light

There are several strategies for protecting against the potential harmful effects of HEV light. These include using screen filters on electronic devices, wearing sunglasses that block HEV light, and limiting exposure to artificial light in the evening.

See Also

• Light therapy
• Blue light
• Photobiology

‎