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Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing the power of the lens relative to ...
Eyeglass prescription. Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.
Reading glasses are available without prescription from drugstores, and offer a cheap, practical solution, though these have a pair of simple lenses of equal power, and so will not correct refraction problems like astigmatism or refractive or prismatic variations between the left and right eye. For the total correction of the individual's sight ...
This article contains the results of the 2024 Democratic Party presidential primaries and caucuses, the processes by which the Democratic Party selects delegates to attend the 2024 Democratic National Convention. The series of primaries, caucuses, and state conventions culminate in the national convention, where the delegates cast their votes ...
Steampunk fashion has no set guidelines but tends to synthesize modern styles with influences from the Victorian era. Such influences may include bustles , corsets , gowns, and petticoats ; suits with waistcoats , coats, top hats [ 76 ] and bowler hats (themselves originating in 1850 England), tailcoats and spats ; or military-inspired garments.
In 1974 IBM started a project to build a telephone switching computer that required, for the time, immense computational power. Since the application was comparably simple, this machine would need only to perform I/O, branches, add register-register, move data between registers and memory, and would have no need for special instructions to perform heavy arithmetic.
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