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Ultratech Stepper, Inc., was founded in 1979 by Leo de Bos, located in Santa Clara, California. The product line consisted of 1x microlithography steppers, using a unique catadioptric lens design. Until 1992, Ultratech Stepper, Inc., was a subsidiary of General Signal. Previous presidents included Leo de Bos and George Rutland.
America's Best Contacts & Eyeglasses is a discount provider of eye examinations, eyeglasses and contact lenses, with over 1000 retail locations in the United States as of May 31, 2024. The millennial store is located in Philadelphia, PA, which happened to be one of National Vision's first markets in their early days over 40 years ago.
The ability of an exposure system, such as a stepper, to resolve narrow lines is limited by the wavelength of the light used for illumination, the ability of the lens to capture light (or actually orders of diffraction) coming at increasingly wider angles (called numerical aperture or N.A.), and various improvements in the process itself. This ...
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Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi-focal lenses. Additionally, the ideal near-vision correction can be achieved with precision, because the variable lenses emulate the focusing action of the youthful (non-presbyopic) eye.
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