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Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both. Current bifocals and progressive lenses are static, in that the user has to change their eye position ...
In the United States, driver's licenses are issued by each individual state, territory, and the District of Columbia rather than by the federal government due to federalism. Drivers are normally required to obtain a license from their state of residence. All states of the United States and provinces and territories of Canada recognize each ...
Joshua's Law. Joshua’s Law is a Georgia state law enacted in 2007 [1] changing the driver's license requirements for teen drivers. [2] A teen driver must meet the new requirements to obtain a Georgia driver’s license. The law was named after Joshua Brown, who died in an accident in 2003. [3]
The Driver License Compact is an agreement between states in the United States of America. The compact is used to exchange data between motorist's home state and a state where the motorist incurred a vehicular violation. Not all states are members, and states respond to the data differently. [1]
Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]
A typical surveying prism with back target. In surveying, a retroreflector—usually referred to as a prism —is normally attached on a surveying pole and is used as a target for distance measurement, for example, a total station. The instrument operator or robot aims a laser beam at the retroreflector.
A pair of contact lenses, positioned with the concave side facing upward. Putting contacts in and taking them out. One-day disposable contact lenses with blue handling tint in blister-pack packaging. Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used ...
A driver's license, driving licence, or driving permit is a legal authorization, or the official document confirming such an authorization, for a specific individual to operate one or more types of motorized vehicles—such as motorcycles, cars, trucks, or buses —on a public road. Such licenses are often plastic and the size of a credit card.