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Corrective lens. A pair of contact lenses, positioned with the concave side facing upward. A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia.
Gmail is the email service provided by Google. As of 2019, it had 1.5 billion active users worldwide, making it the largest email service in the world. [1] It also provides a webmail interface, accessible through a web browser, and is also accessible through the official mobile application. Google also supports the use of third-party email ...
There are three main classes of medical devices according to the potential risk that they might have on human health. Class 1 – Very low-risk devices and drugs. For example, dental floss and bedpans. Class 2 – Devices with a higher risk than Class 1. For example, condoms and pregnancy tests. Class 3 – Devices with a very high risk to ...
The iPhone [10] (retroactively referred to as the iPhone 2G, [11] iPhone 1, [12] or original iPhone [11]) is the first iPhone model and the first smartphone designed, developed, and marketed by Apple Inc. After years of rumors and speculation, it was officially announced on January 9, 2007, [13] and was released in the United States on June 29 ...
A Wollaston prism is an optical device, invented by William Hyde Wollaston, that manipulates polarized light. It separates light into two separate linearly polarized outgoing beams with orthogonal polarization. [1] The two beams will be polarized according to the optical axis of the two right angle prisms. The Wollaston prism consists of two ...
Toftness device. The Toftness Radiation Detector is an instrument used by some chiropractors. It was patented by Irwing N. Toftness in 1971, [1] and was banned from use in the United States in 1982. [2] Toftness claimed that it detected electromagnetic radiation emanating from vertebral subluxations (small dislocations). [3]
Human penis. In human anatomy, the penis ( / ˈpiːnɪs /; pl.: penises or penes; from the Latin pēnis, initially "tail" [1]) is an external male sex organ ( intromittent organ) that additionally serves as the urinary duct. The main parts are the root, body, the epithelium of the penis including the shaft skin, and the foreskin covering the glans.
Superintendent Douglas DeMoura. The Massachusetts Correctional Institution—Cedar Junction (MCI-Cedar Junction), formerly known as MCI-Walpole, is a maximum security prison under the jurisdiction of the Massachusetts Department of Correction. It was opened in 1956 to replace Charlestown State Prison, the oldest prison in the nation at that time.