Cyanopsia is a medical term for seeing everything tinted with blue. It is also referred to as blue vision. Cyanopsia often occurs for a few days, weeks, or months after removal of a cataract from the eye. Cyanopsia also sometimes occurs as a side effect of taking sildenafil, tadalafil, or vardenafil.
When light hits an object, some wavelengths are absorbed and others are reflected; we see the reflected visible light as color. The color "blue" is light with wavelengths between about 450 and 490 nanometers. Atomic elements and microscopic structures can reflect blue light.
Just because you close your eyes doesn't mean your eyes and brain shut down immediately. This extraordinary occurrence is called phosphene, and it's believed to appear because of light inside our eyes.
When we close our eyes in sunlight, why do we see blue colours everywhere after? Shut eyelids still aren't 100% opaque. So a fraction of the bright sunlight filters through the eyelids to the eyes. This filtered sunlight gets a reddish tinge due the blood flowing in the eyelids.
Certain conditions may cause a blue tint to the visual field (cyanopsia), such as cataract removal or use of sildenafil. Cyanopsia may occur for a few days after cataract removal or as an adverse effect of sildenafil and possibly other phosphodiesterase-5 (PDE5) inhibitors.
There are lots of reasons someone can have blue “whites”. Anything that results in a thinning of the sclera could cause it. For example, some medications, like steroids, can produce blue sclera. Not having enough iron in your blood (anemia) and aging have also been shown to give a blue tint to the whites of the eye.
A study in the journal Frontiers in Neurology, is shedding light on a rare side effect of the erectile dysfunction drug sildenafil. The active ingredient in Viagra, sildenafil can cause the vision in some men to be tinted blue.
Kaleidoscopic vision is most often caused by a type of migraine headache known as a visual or ocular migraine. A visual migraine occurs when nerve cells in the part of your brain responsible for vision begin firing erratically. It generally passes in 10 to 30 minutes.
Seeing colours when you close your eyes is totally normal. It's just part of the way your eyes work. Some people notice them, and some do not. However, much more obvious phosphenes can occur in some eye diseases.
The most common cause of kaleidoscope vision is an ocular migraine, which is a migraine accompanied by visual symptoms. About 20% of people who suffer from migraines experience some type of aura, also known as a sensory disturbance.
Chloropsia may result from damage to photoreceptors and retinal ganglion cells but is rare. The mechanism for CBS is believed to be a cortical release phenomenon. The visual cortex attempts to independently “fill-in” sensory-deprived regions in a cerebral phenomenon similar to the “phantom-limb” syndrome.
Phosphenes are considered a normal phenomenon, but they have also made a brief acquaintance with MS. The most obvious relationship phosphenes have with MS is by way of the common symptom, optic neuritis.
When a blood vessel in the brain becomes blocked for a short period of time, the blood flow to that area of the brain slows or stops. This lack of blood (and oxygen) often leads to temporary symptoms such as slurred speech or blurred/blacked out vision.
Blue-yellow color blindness
This less-common type of color blindness makes it hard to tell the difference between blue and green, and between yellow and red. There are 2 types of blue-yellow color blindness: Tritanomaly makes it hard to tell the difference between blue and green, and between yellow and red.
Meister and Joesch hypothesize that when the light is dim, the rods are active, and they dampen the output of the red and green cones. But the long-wavelength cone cell, also known as the blue cone cell, keeps going all on its lonesome. That gives you the impression that you're seeing blue.
Blue is the colour of the mind and is essentially soothing; it affects us mentally, rather than the physical reaction we have to red. Strong blues will stimulate clear thought and lighter, soft blues will calm the mind and aid concentration. Consequently it is serene and mentally calming.
Eigengrau (German for "intrinsic gray"; pronounced [ˈʔaɪ̯gŋ̍ˌgʁaʊ̯]), also called Eigenlicht (Dutch and German for "intrinsic light"), dark light, or brain gray, is the uniform dark gray background color that many people report seeing in the absence of light.
Phosphenes are the moving visual sensations of stars and patterns we see when we close our eyes. These are thought to be caused by electrical charges the retina produces in its resting state. Phosphenes can also be caused by mechanical stimulation of the retina through applied pressure or tension.
Charles Bonnet syndrome is a condition where you see things that are not real (hallucinations). It can happen if you've lost a lot of your sight. It's not caused by a mental health problem or dementia.
Hypnopompic hallucinations occur while a person is waking up, and hypnagogic hallucinations occur while falling asleep. In 86% of cases, hypnopompic hallucinations are visual. They often involve seeing moving shapes and colors, or images of animals or people. Between 8% and 34% of these hallucinations involve sound.
Most people see splashes of colors and flashes of light on a not-quite-jet-black background when their eyes are closed. It's a phenomenon called phosphene, and it boils down to this: Our visual system — eyes and brains — don't shut off when denied light.
Sudden changes in color vision can indicate a serious disease, and the AAO recommends you make an appointment to see your ophthalmologist if you notice a change in the way you perceive colors. Diseases which could cause changes in color vision include: Metabolic disease. Vascular disease, including diabetic retinopathy.
Cones are the cells in the eyes that see color. If you stare at one color for too long, they fatigue. Until they recover, it's a common optical illusion to see the opposite color on the color wheel. So, staring at yellow for too long can make you see purple.
At noon, when the Sun is overhead it appears white. This is because the light travels a shorter distance through the atmosphere to get to us; it's scattered very little, even the blue light. During the day the sky looks blue because it's the blue light that gets scattered the most.