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Sloan letters, designed by Louise Sloan in 1959, are a set of optotypes used to test visual acuity generally used in Snellen charts and logMAR charts. This set of optotypes consists of ten specially formed "letters", C, D, H, K, N, O, R, S, V and Z. [ 1 ] These letters, unlike the ones used in older Snellen charts, are designed to give acuity ...
The chart was designed by Ian Bailey [5] and Jan E. Lovie-Kitchin at the National Vision Research Institute of Australia. [1] [3] They described their motivation for designing the LogMAR chart as follows: "We have designed a series of near vision charts in which the typeface, size progression, size range, number of words per row and spacings were chosen in an endeavour to achieve a ...
A police officer in Taiwan wears a white motorcycle helmet in conjunction with a high-visibility vest. According to a 2004 study, the wearing of reflective or fluorescent clothing correlated with a 37 percent lower risk of a rider sustaining a crash-related injury; likewise, white helmets demonstrated a 24 percent reduction.
Pith helmet – for use in tropical regions; the American fiber helmet is a version of it; Pork pie hat; Shovel hat; Sidara – national Iraqi headgear; Shtreimel; Sombrero; Spodik; Keffiyah or sudra; Papal tiara – a hat traditionally worn by the Pope, which has been abandoned in recent decades, in favor of the mitre
The symbols on an acuity chart are formally known as "optotypes". Variation of Snellen chart with another letter sequence. Australia, 1946. In the case of the traditional Snellen chart, the optotypes have the appearance of block letters, and are intended to be seen and read as letters. They are not, however, letters from any ordinary ...
Personnel Armor System for Ground Troops (PASGT, pronounced / ˈ p æ z ɡ ə t / PAZ-gət) is a combat helmet and ballistic vest that was used by the United States military from the early 1980s until the early or mid-2000s, when the helmet and vest were succeeded by the Lightweight Helmet (LWH), Modular Integrated Communications Helmet (MICH), and Interceptor body armor (IBA) respectively.
An early ECH prototype; the production model uses a slightly different chinstrap and is painted coyote brown. Video of the ECH U.S. Marine wearing an ECH in 2018. The Enhanced Combat Helmet (ECH) is a combat helmet designed in conjunction of a joint program of the United States Marine Corps and United States Army to replace the current combat helmets in use by the U.S. Army, Marines, Navy, and ...
The Integrated Helmet and Display Sight System (IHADSS) 30 mm M230 chain gun turret on a Boeing AH-64 Apache being aimed with a helmet-mounted sight A helmet-mounted display (HMD) is a headworn device that uses displays and optics to project imagery and/or symbology to the eyes.