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It is light-sensitive and communicates visual messages to the brain. If the retina detaches, it moves and shifts from its normal position. This can cause photopsia, but can also cause permanent vision loss. Medical attention is needed to prevent vision loss. Procedures may include laser treatment, freezing, or surgery.
Migraine prodrome phase symptoms. There are four possible phases of a migraine attack: prodrome, aura, attack and post-drome, the Mayo Clinic explains. Not everyone who gets a migraine attack will ...
Flicker vertigo, sometimes called the Bucha effect, is "an imbalance in brain-cell activity caused by exposure to low-frequency flickering (or flashing) of a relatively bright light." [ 1 ] It is a disorientation -, vertigo -, and nausea -inducing effect of a strobe light flashing at 1 Hz to 20 Hz, approximately the frequency of human brainwaves .
Fluorescent lamps with magnetic ballasts flicker at a normally unnoticeable frequency of 100 or 120 Hz (twice of the utility frequency; the lamp is lit on both the positive and negative half-wave of a cycle). This flickering can cause problems for some individuals with light sensitivity [1] and are
A signature feature of a fluorescent light bulb is the subtle hum or buzz, but if it increases in volume or becomes too much, you'll want to check for a larger problem. The most likely cause is a ...
Many variations occur, but scintillating scotoma usually begins as a spot of flickering light near or in the center of the visual field, which prevents vision within the scotoma area. It typically affects both eyes, as it is not a problem specific to one eye. [5] [6] The affected area flickers but is not dark. It then gradually expands outward ...
While any type of severe abdominal pain needs immediate medical attention, these symptoms are the most commonly associated with appendicitis, according to Mayo Clinic. Pain that starts suddenly in ...
There are many causes of seizures. Organ failure, medication and medication withdrawal, cancer, imbalance of electrolytes, hypertensive encephalopathy , may be some of its potential causes. [ 2 ] The factors that lead to a seizure are often complex and it may not be possible to determine what causes a particular seizure, what causes it to ...