Blue light spectrum
The blue light spectrum, characterized by wavelengths between 400 and 500 nanometers, has a broad impact on human health, influencing numerous physiological processes in the human body. Although blue light is essential for regulating circadian rhythms, improving alertness, and supporting cognitive function, its widespread presence has raised worries about its possible effects on general well-being.
Prolonged exposure to blue light poses hazards to the well-being of the eye and may cause symptoms like dry eyes, weariness, and blurred vision. As our dependence on digital devices and artificial lighting increases, it is crucial to understand the complex pathways of the blue light spectrum that affect biological processes. To reduce the hazards of blue light exposure, effective management strategies can be implemented, including limiting screen time before bed and using blue light filter.
The blue light spectrum is an essential part of the visible spectrum with wavelengths of about 400-480 nm. Blue light is primarily generated by Light-Emitting Diodes lighting and digital screens, it has now become prevalent in the world around us. LED lighting creates white light by combining blue light with other wavelengths, often with a yellow garnet phosphor. Blue lights from digital screens, including computers, smartphones, and tablets, emit significant amounts of blue light, contributing to constant exposure throughout the day and night.
Blue light has a significant impact on numerous physiological processes in human health. The widespread use of blue light in modern technology brings up a concern about the potential consequences of excessive blue light exposure. Such exposure has been associated with disruptions in ocular health, sleep patterns, and well-being.
Natural
Sunlight is the primary natural source of blue light, which is essential for regulating the circadian rhythm. Excessive exposure to sunlight without proper eye protection can lead to eye damage and cause vision issues.Artificial
lighting, digital screens, and fluorescent bulbs are examples of common artificial blue light sources.LED lighting is widely used due to its durability and energy efficiency. It emits more blue light than traditional incandescent bulbs, potentially impacting the quality of sleep and eye health if used excessively at night.
Blue light is emitted by digital screens such as computers, tablets, smartphones, and televisions, which can lead to extended exposure in modern lives. Digital screen overuse, especially before bed, can cause dry eyes, eye strain, and irregular sleep patterns.
Fluorescent lighting emits blue light and is frequently used in public areas and workplaces. Long-term use of fluorescent light bulbs can cause eye strain, exhaustion, and circadian rhythm problems, especially in interior spaces with little natural light exposure.
Mechanism
The short wavelength and high energy of blue light make it highly effective in penetrating the human eye and inducing biological effectsEffects on cornea
The cornea is located at the front of the eyeball and serves as the initial point where light enters the eye. Blue light exposure to the cornea increases the production of reactive oxygen species, molecules in corneal epithelial cells. This activates a signalling pathway involving ROS, triggering inflammation in human corneal epithelial cells. Oxidative damage and potential cell death contribute to inflammation in the eye and the development of dry eyes.Blue light disrupts the balance of the tear film on the cornea. Prolonged exposure to blue light leads to an increased rate of tear evaporation, resulting in dryness of the cornea and the development of dry eye syndrome.
Effects on lens
The lens is located at the entrance of the eyeball after light passes through the pupil. The lens is capable of filtering blue light, reducing retinal light damage occurrence. Blue light is absorbed by the structural proteins, enzymes, and protein metabolites found in the lens. The absorption of blue light creates yellow pigments in the lens's protein. The lens progressively darkens and turns yellow. Blue light is absorbed by the lens, preventing blue light from reaching the retina at the back of the eye. To prevent retinal damage, the lens has to lower transparency. This reaction causes visual impairment and the development of cataracts, a cloudy region in the lens.Cumulative exposure to blue light also induces an increase in the production of ROS, free radicals, in the lens epithelial cells mitochondria. Accumulation of oxidative damage by free radicals in the lens contributes to the development of cataracts.
Effects on retina
The retina is a receiver of light signals and plays a crucial part in the process of visual formation. The retina is located at the back of the eye. Blue light can induce photochemical damage to the retina by passing through lenses and into the retina.Two primary types of cells contribute to vision formation within the retina: photoreceptors, and retinal pigment epithelium cells. Photoreceptors are responsible for detection of light particles and convert them into detectable signals, initiating the visual process. RPE cells are located below the photoreceptor layer and maintain the integrity and functionality of the retina.
The primary cause of blue light's effects on the retina is the production of ROS that leads to oxidative stress, meaning the imbalance between the generation of harmful reactive free radicals and the body's ability to conduct detoxification. Retinal chromophores like lipofuscin and melanin absorb light energy, causing the generation of ROS and oxidative damage to retinal cells. The accumulation of oxidative stress from excessive exposure to blue light causes photochemical damage to the retina. Phototoxicity is caused by lipofuscin, which builds up inside RPE cells as a consequence of photoreceptor metabolism that is enhanced by exposure to blue light. This oxidative stress damages DNA integrity and interferes with protein homeostasis and mitochondrial activity within retinal cells, potentially contributing to disorders like cellular damage, retinal degeneration and eyesight impairment.
Sleep disturbance
The circadian rhythm governs the sleep-wake cycle over a roughly 24-hour cycle, and is regulated by the suprachiasmatic nucleus in the brain. The SCN communicates with specialised cells called intrinsically photosensitive retinal ganglion cells, to synchronise the internal biological clocks with external light-dark cycles.When ipRGCs are activated by blue light, a signalling cascade is initiated, enabling the alignment of internal biological clocks with environmental light cues. Exposure to blue light during daylight hours suppresses the secretion of melatonin, a hormone critical for circadian rhythm regulation. Melatonin is synthesised by the pineal gland, located in the middle of the brain, in response to darkness, signalling the body's transition to sleep. However, exposure to blue light at night disrupts the production and release of melatonin, leading to sleep disturbances. Melatonin is released in the blood circulation to reach target tissues in the central and peripheral regions. The amount of blue light received by ipRGCs regulates the circadian rhythm to control cycles of alertness and sleepiness. The more light stimulation, the less signals are transmitted to the pineal gland through the SCN of the hypothalamus to produce melatonin. Blue light exposure, particularly in the evening or at night, suppresses the production and release of melatonin. When light stimulates and activates the SCN, the paraventricular nucleus of the hypothalamus receives more signals from a neurotransmitter called GABA. GABA is an inhibitory neurotransmitter that aids in controlling neuronal activity. Both the neuronal pathway PVN and the pineal gland experience a decrease in activity as a response. This suppresses the release of melatonin. The suppression of melatonin release disrupts the body's natural circadian rhythm and interferes with the body's ability to fall asleep and achieve a restful sleep state, potentially leading to sleep disorders such as insomnia.
Ocular health
The impact of blue light exposure on human health highlights the significance of reducing blue light exposure, particularly when using screens for prolonged periods of time, to protect ocular health and reduce the risk of vision-related issues.Harmful impacts on the well-being of the eye after prolonged exposure to blue light, particularly from digital screens or fluorescent lamps, have been observed. Systematic reviews have highlighted the association between blue light exposure and digital eye strain. Digital screens emit significant amounts of blue light with shorter wavelength and higher energy compared to other visible light, which can cause symptoms such as eye fatigue, eye dryness, blurred vision, irritation, and headaches. Blue light exposure can lead to light-induced damage to the retina, a phenomenon known as photochemical damage. When the eye is exposed to excessive levels of blue light from sources such as digital screens, a series of photochemical reactions within the retina can be stimulated. The photochemical reactions cause the production of ROS, inducing oxidative stress and damage cellular components in the eye such as ipRGCs.