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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.
An example of the scintillating grid illusion. Dark dots seem to appear and disappear at intersections. The scintillating grid illusion is an optical illusion, discovered by E. and B. Lingelbach and M. Schrauf in 1994. [2] It is often considered a variation of the Hermann grid illusion but possesses different properties. [2] [3]
Some describe seeing one or more shimmering arcs of white or colored flashing lights. An arc of light may gradually enlarge, become more obvious, and may take the form of a definite zigzag pattern, sometimes called a fortification spectrum (i.e. teichopsia , from Greek τεῖχος, town wall), because of its resemblance to the fortifications ...
She adds that if dizziness is accompanied by any of the following symptoms, you should also see a doctor ASAP: neurological symptoms (such as loss of vision or double vision), slurred speech ...
It controls the ability to see things. Impaired blood flow to the cells of the occipital lobe ( ischemia , for example as caused by a TIA or Vertebrobasilar insufficiency ) will lead to temporary visual problems; if the poor blood flow is sustained it will lead to cell death ( infarction , for example as caused by a stroke ) which may cause ...
Ocular migraines affect your vision in one or both eyes. Here, experts share ocular migraine symptoms, causes, and treatments.
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 ...
A visual hallucination is a vivid visual experience occurring without corresponding external stimuli in an awake state. These experiences are involuntary and possess a degree of perceived reality sufficient to resemble authentic visual perception. [1]