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Visual snow syndrome (VSS) is an uncommon neurological condition in which the primary symptom is that affected individuals see persistent flickering white, black, transparent, or colored dots across the whole visual field. [7] [4] Other common symptoms are palinopsia, enhanced entoptic phenomena, photophobia, and tension headaches.
Most commonly associated with cataract surgery and certain medications, such as sildenafil, cyanopsia is typically a temporary side effect rather than a standalone disease. The condition primarily affects the retina , the light-sensitive layer at the back of the eye , and sometimes the optic nerve , which transmits visual signals to the brain .
Green flash occurs because the atmosphere causes the light from the Sun to separate, or refract, into different frequencies. Green flashes are enhanced by mirages, which increase refraction. A green flash is more likely to be seen in stable, clear air, when more of the light from the setting sun reaches the observer without being scattered.
Illusory palinopsia is often worse with high stimulus intensity and contrast ratio in a dark adapted state.Multiple types of illusory palinopsia often co-exist in a patient and occur with other diffuse, persistent illusory symptoms such as halos around objects, dysmetropsia (micropsia, macropsia, pelopsia, or teleopsia), Alice in Wonderland Syndrome, visual snow, and oscillopsia.
Ocular migraines affect your vision in one or both eyes. Here, experts share ocular migraine symptoms, causes, and treatments.
Palinopsia (Greek: palin for "again" and opsia for "seeing") is the persistent recurrence of a visual image after the stimulus has been removed. [1] Palinopsia is not a diagnosis; it is a diverse group of pathological visual symptoms with a wide variety of causes. Visual perseveration is synonymous with palinopsia.
A green apple for instance looks green to us at midday, when the main illumination is white sunlight, and also at sunset, when the main illumination is red. Color phi phenomenon: The color phi phenomenon is a perceptual illusion in which a disembodied perception of motion is produced by a succession of still images. Contingent perceptual ...
For example, the Mayo Clinic says, you might see: Blind spots, which might be outlined with geometric designs. Shimmering stars or spots. Zigzag lines that slowly float across your vision. Flashes ...