Trystan Casey
Seeing colours and electricity can be a fascinating and sometimes concerning experience. The phenomenon of seeing colours with one's eyes closed is known as phosphenes, and it can be caused by various factors such as pressure on the eyeball, retinal or brain stimulation, or even the use of certain medications. Phosphenes are typically characterized by bursts of light or colour when there is no external light source. While they can be benign, they may also indicate a more serious underlying condition. In terms of electricity, it is typically invisible, but under certain conditions, it can become visible. This occurs when an electric current conducts through the air, ionizing the air molecules and creating a visible plasma. While electricity itself is colourless, the plasma it generates can emit light of various colours, depending on factors such as temperature and the presence of certain elements like nitrogen, oxygen, and hydrogen.
| Characteristics | Values |
|---|---|
| What are the colours and electricity that people see? | Phosphenes are colours or flashes that people see when their eyes are closed. |
| Why do people see phosphenes? | Phosphenes are caused by electrical activity in the brain, which can be triggered by various factors, including pressure on the eyeball, neurological conditions, certain medications, alcohol use or withdrawal, and eye movements associated with conditions like optic neuritis. |
| Can electricity have a colour? | Electricity itself does not have a colour as it is the flow of electrons, which are invisible. However, electricity can produce light with different colours through various processes, such as high-voltage breakdown of air or electrical currents conducting through the air, creating plasma that emits light. |
| What are some instances where people see electricity? | People can sometimes see electricity through plasma spheres, neon lighting, lightning, or a phenomenon known as St. Elmo's Fire, which occurs after thunderstorms when electric fields cause air molecules to become charged and create plasma. |
| What should you do if you experience phosphenes? | While some cases of phosphenes may not require treatment, it is recommended to consult a healthcare provider to determine if there is an underlying cause that needs to be addressed. |
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What You'll Learn
- Phosphenes: colours or flashes seen with eyes closed, caused by pressure on the eyeball, retina or brain
- St. Elmo's Fire: a blue-white glow caused by electricity acting on air molecules
- Photopsia: light flashing when not looking at light, caused by ageing or disease
- Light and colour: light enters the eye, hitting rods and cones, which send electrical signals to the brain
- Electricity and colour: electricity can produce light, but has no colour itself
Phosphenes: colours or flashes seen with eyes closed, caused by pressure on the eyeball, retina or brain
Seeing colours or flashes with your eyes closed is known as phosphenes. Phosphenes are colours or flashes of light that occur when there is no actual light source. They are a result of pressure on the eyeball, retina, or brain.
Phosphenes are caused by the exchange of biophotons between atoms in the eyes. This exchange creates an "excess of biophotons", resulting in intense visuals. Pressure on the eyeball, such as rubbing your eyes, can stimulate the emission of biophotons and cause phosphenes. Additionally, pressure on the retina or brain can also induce phosphenes. For example, in optic neuritis, the optic nerve becomes inflamed and irritated, creating pressure against the photoreceptors in the retina, which can lead to phosphenes.
Phosphenes can also be caused by electrical activity in the brain. Transcranial magnetic stimulation (TMS), used to treat neurological conditions, can induce phosphenes. Furthermore, seizures, which are a result of uncontrolled electrical activity in the brain, can also cause phosphenes.
While phosphenes can occur spontaneously, they may also be triggered by certain factors. These include sneezing hard, experiencing a sudden drop in blood pressure, or taking certain medications. In some cases, phosphenes may be a symptom of an underlying condition, such as migraines, seizures, or dementia. Therefore, it is recommended to consult a healthcare provider if you experience phosphenes to determine if further evaluation or treatment is necessary.
It is worth noting that photopsia is a similar phenomenon, referring to light flashing when there is no actual light source, which can be due to aging or certain medical conditions.
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St. Elmo's Fire: a blue-white glow caused by electricity acting on air molecules
St. Elmo's Fire is a weather phenomenon that often appears on the masts of ships and the wings of airplanes. It is a type of continuous electric spark called a "glow discharge" or corona discharge. It occurs when there is a significant imbalance in the electrical charge, causing molecules to tear apart and emit light.
The phenomenon is named after St. Erasmus of Formia (also known as St. Elmo), the patron saint of sailors. It has been observed for centuries, with figures like Magellan, Caesar, Columbus, and Pliny the Elder documenting their experiences with the blue-white glow. In the 14th century, seeing St. Elmo's Fire was considered a positive omen, often occurring towards the end of a storm and bringing hope of calmer seas.
The colour of St. Elmo's Fire is due to the gases in the Earth's atmosphere, primarily nitrogen and oxygen, which glow blue when they become plasmas. The intensity of the effect, a blue or violet glow around the object, is proportional to the strength of the electric field. This is why St. Elmo's Fire is most noticeable during thunderstorms or volcanic eruptions, where the electric field is intensified.
St. Elmo's Fire is a rare instance where electricity acts in a way that makes it visible to the human eye. Normally, electricity is invisible as it is the flow of electrons, which are too small to be seen by photons. However, when high-voltage electricity interacts with the air, it can tear apart air molecules, creating a plasma that emits light.
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Photopsia: light flashing when not looking at light, caused by ageing or disease
Photopsia is a phenomenon where one sees flashes of light without an external light source. These flashes can manifest as sparkles, streaks, or shapes like lightning bolts, and they can occur in one or both eyes. Photopsia is typically age-related, but it can also indicate an underlying disease or medical condition.
Photopsia is a type of visual disturbance, often referred to as “seeing stars." It occurs when temporary pressure is placed on the retina of the eye, resulting in momentary flashes of light, even in the absence of external illumination. This pressure can be caused by various factors, including physical exertion, straining, or a hard sneeze. Photopsia can also be triggered by stress, fatigue, or exposure to bright light.
While photopsia is often benign and may resolve without treatment, it can sometimes be a symptom of a more serious condition. For example, photopsia may be an early sign of cerebrovascular disease, which includes conditions such as stroke, brain bleeds, and brain aneurysms. It can also be associated with postural hypotension, concussion, and preeclampsia. In some cases, photopsia may indicate retinal detachment, a medical emergency that can lead to permanent vision loss if left untreated.
Additionally, photopsia has been linked to specific eye conditions, such as retinitis pigmentosa (RP), glaucoma, and dry eye syndrome. It can also accompany migraine headaches, posterior vitreous detachment, retinal detachment, optic neuritis, and eye trauma. Photopsia may also be influenced by certain medications or alcohol consumption. Given the potential underlying causes, it is advisable to consult an eye care provider for a comprehensive eye exam if photopsia occurs.
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Light and colour: light enters the eye, hitting rods and cones, which send electrical signals to the brain
Light enters the eye through the cornea, the clear front layer of the eye. The cornea bends the light before it passes through the pupil, the black opening in the center of the iris. The iris controls the size of the pupil, which in turn controls the amount of light that can enter the eye.
After passing through the pupil, the light then passes through a lens and a watery substance called the aqueous humor. It then reaches the back of the eye, which is filled with a clear, gelatinous substance called the vitreous. Here lies the retina, the light-sensitive layer at the back of the eye. The retina contains photoreceptors, which are specialized light-detecting cells. There are two types of photoreceptors: rods and cones.
Rods and cones are essential for our sense of vision. They take the light that enters our eyes and convert it into electrical signals that our brains can use to interpret what we see. When light lands on the rods and cones, it activates chemical and electrical processes in those receptors and the connected retinal cells. These processes are how the photoreceptor and retinal cells convert light into signals that the brain can use to build what we see.
Cones require a lot more light than rods and are used to see color. We have three types of cones: blue, green, and red. The human eye has about 6 million cones, many of which are packed into the fovea, a small pit in the back of the eye that helps with the sharpness and detail of images. Rods, on the other hand, work at very low levels of light and are used for night vision. The human eye has over 100 million rod cells. While rods do not help with color vision, they allow us to see in dimly lit environments, which is why we see in grayscale at night.
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Electricity and colour: electricity can produce light, but has no colour itself
Electricity is the flow of electrons, which are invisible to the human eye. Electrons are about a billion times smaller than the smallest visible photons, and as they do not scatter, they have no colour. When electrons lose energy, they emit photons, and when they gain energy, they absorb photons. However, electricity can produce light under certain conditions.
For instance, a high-voltage breakdown of air caused by very energetic electrons can create plasma, which emits light. This phenomenon is known as St. Elmo's Fire, often observed by sailors as a blue-white glow of electricity around ships' masts. Similarly, lightning is another natural occurrence of electricity producing light. The purple colour associated with lightning is due to the atomic emission of nitrogen, oxygen, and hydrogen.
Electric arcs are another way electricity becomes visible, occurring when an electric current bridges an air gap and ionises the air molecules, creating a plasma bridge. This property is utilised in spark plugs and can be very useful when controlled but can also be dangerous during electrical faults, leading to arc 'flashes' and extremely high temperatures.
While electricity itself has no colour, it can interact with different materials to produce light with various wavelengths, resulting in different colours. For example, LED lights use electricity to change the energy states of electrons and holes, producing light with different wavelengths and, consequently, different colours.
It is worth noting that some people may experience seeing colours related to electrical activity in the brain or eyes. This phenomenon is known as phosphenes, which can be caused by various factors such as pressure on the eyeball, neurological conditions, or certain medications. While often harmless, it is recommended to consult a healthcare provider to identify and address any underlying causes.
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Frequently asked questions
This phenomenon is called phosphenes, which are colours or flashes you see when your eyes are closed. Phosphenes are caused by pressure on the eyeball, or retina or brain stimulation. They can also be caused by prescription and non-prescription medications, alcohol, withdrawal from alcohol or medications, or rubbing your eyes.
You may be able to prevent phosphenes by managing other chronic diseases like diabetes, low blood pressure or migraines.
It is recommended that you contact a healthcare provider if you experience phosphenes. While some cases may not need treatment, a healthcare provider will be able to determine if there is an underlying cause that needs to be addressed.
Electricity is the flow of electrons and does not have a colour. However, electricity can produce light through various means, such as high-voltage breakdown of air, which creates plasma and emits light. Therefore, when we see electricity, we are usually seeing the light produced by its interaction with the air or other elements, such as nitrogen, oxygen, and hydrogen.
The back of the eye has a tissue called the retina, which contains light-sensitive cells called rods and cones. These cells detect light and send signals to the brain via the optic nerve. Different rods and cones react to different wavelengths, or colours, of light. The brain processes these signals and creates the experience of seeing colour.
