Deflectometric measurement of mechanical spectacle lens deformation
نویسندگان
چکیده
منابع مشابه
Mechanical design of a power-adjustable spectacle lens frame.
Power-adjustable spectacle lenses, based on the Alvarez-Lohmann principle, can be used to provide affordable spectacles for subjective refractive errors measurement and its correction. A new mechanical frame has been designed to maximize the advantages of this technology. The design includes a mechanism to match the interpupillary distance with that of the optical centers of the lenses. The fra...
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Majority of the advances in spectacle lens continue to occur in the area of progressive lens design by most of the spectacle lens manufacturers. Since the introduction of progressive addition lenses (PALs) in 1959 by Essilor, it has gained worldwide acceptance for the treatment of presbyopia. While progressive lens design, manufacturing and dispensing techniques have grown at a good pace in the...
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PURPOSE Previous studies have shown that chick eyes compensate for positive or negative lenses worn for brief periods if the chicks are in darkness the remainder of the time. This study was undertaken to determine whether chicks can compensate for brief periods of lens wear if given unrestricted vision the remainder of the time. Previous studies have also shown that chick eyes alternately weari...
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The objective of this descriptive study was to determine the frequency with which patients return for re-examination due to a failure of spectacle lens acceptance and to quantify the reasons for the failure. A random sample of patient records was reviewed to determine the rate of spectacle lens prescription. Spectacles reassessment records, completed after dispensing problems were dealt with we...
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In the quest for a solution to presbyopia and due to the inability to restore the eye's system itself, man in the last centuries resoned to a continuous evolution of increasingly sophisticated types of eyeglasses (Fowler and Patreas, 1991). What technology has had to offer so far, as practical products, were glasses that utilize rigid lenses. The most advanced solution on the market today is sp...
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ژورنال
عنوان ژورنال: Ophthalmic and Physiological Optics
سال: 2000
ISSN: 0275-5408,1475-1313
DOI: 10.1046/j.1475-1313.2000.00533.x