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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 .
While cyanopsia can be briefly disorienting, it rarely interferes significantly with daily activities. Symptoms usually resolve on their own within hours to weeks, depending on the cause. Cyanopsia after cataract surgery diminishes as the eye adapts, while medication-induced cyanopsia resolves once the medication's effects wear off.
During pregnancy, new-onset photopsia is a concern for severe preeclampsia. Photopsia can present as retinal detachment when examined by an optometrist or ophthalmologist . However, it can also be a sign of uveal melanoma .
One example of a pressure phosphene is demonstrated by gently pressing the side of one's eye and observing a colored ring of light on the opposite side, as detailed by Isaac Newton. [ 7 ] [ 8 ] [ 9 ] Another common phosphene is "seeing stars" from a sneeze , laughter, a heavy and deep cough, blowing of the nose , a blow on the head or low blood ...
The perioperative period is the period of a patient's surgical procedure. [1] It commonly includes ward admission, anesthesia, surgery, and recovery.Perioperative may refer to the three phases of surgery: preoperative, intraoperative, and postoperative, though it is a term most often used for the first and third of these only - a term which is often specifically utilized to imply 'around' the ...
Researchers worry that people who exercise regularly might be sedentary to a harmful degree during the rest of the day because they think of their day in two blocks, active time and resting time ...
Dysmenorrhea, also known as period pain, painful periods or menstrual cramps, is pain during menstruation. [4] [5] [2] Its usual onset occurs around the time that menstruation begins. [1] Symptoms typically last less than three days. [1] The pain is usually in the pelvis or lower abdomen. [1] Other symptoms may include back pain, diarrhea or ...
Flashing lights (such as strobe lights) or rapidly changing or alternating images (as in clubs, around emergency vehicles, near overhead fans, in action movies or television programs, etc.) are examples of patterns in time that can trigger seizures, and these are the most common triggers. Static spatial patterns such as stripes and squares may ...