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Specialty. Neurology. Frequency. 1 in 4000 [1] Photosensitive epilepsy ( PSE) is a form of epilepsy in which seizures are triggered by visual stimuli that form patterns in time or space, such as flashing lights; bold, regular patterns; or regular moving patterns. PSE affects approximately one in 4,000 people (5% of those with epilepsy).
Red and blue emergency lights on a fire engine in Canberra, Australia. Emergency vehicle lighting, also known as simply emergency lighting or emergency lights, is a type of vehicle lighting used to visually announce a vehicle's presence to other road users. A sub-type of emergency vehicle equipment, emergency vehicle lighting is generally used ...
Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the ...
The height of the light above the chart datum for height (usually based on high water ). e.g. 15m for 15 metres. The range in which the light is visible, e.g. "10M" for 10 nautical miles. An example of a complete light characteristic is "Gp Oc (3) W 10s 15m 10M". This indicates that the light is a group occulting light in which a group of three ...
American helmer Carson Lund uses the baseball diamond as a deeply cinematic space in his feature debut, “Eephus.” The esoteric title is the name of one of the game’s rarest pitches.
Fender benders mean serious high-tech repairs now. Auto body repair was a pretty straightforward business not that long ago. When metal got bent in a crash, someone needed to unbend it. It was a ...
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.
Aviation obstruction lighting. Emley Moor transmitting station using a red warning beacon. Aviation obstruction lighting is used to enhance the visibility of structures or fixed obstacles which may conflict with the safe navigation of aircraft. Obstruction lighting is commonly installed on towers, buildings, and even fences located in areas ...