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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
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 .
The inner-ear condition Ménière's disease can be aggravated by flicker. Sufferers of vertigo are recommended to not use fluorescent lights. Polymorphous light eruption is a condition affecting the skin thought to be caused by an adverse reaction to ultraviolet light. Its prevalence across Europe is 10-20% of the population.
Mold. Molds are a type of fungus that grow in dark, damp areas and can cause allergies in some people, resulting in skin rash, itchy eyes, sinus, and breathing issues.Molds can be found in the ...
In most cases, photopsia is a symptom of a preexisting condition. The underlying condition must be identified and treated to resolve the symptoms. Photopsia is the presence of perceived flashes of light in the field of vision .
Artist's depiction of a scintillating scotoma, exhibiting a flashing visual pattern similar to dazzle camouflage used during WWI.. Scintillating scotoma is a common visual aura that was first described by 19th-century physician Hubert Airy (1838–1903).
WEST LONG BRANCH - Lights flickering on and off, seemingly at random. The sound of organ music echoing. Unexplained cold spells and visions. Eerie experiences in the elevators, where tragedy ...
This is the list of extremely hazardous substances defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. § 11002). The list can be found as an appendix to 40 CFR 355. [1] Updates as of 2006 can be seen on the Federal Register, 71 FR 47121 (August 16, 2006). [2]