TRIAL LENSES
نویسندگان
چکیده
منابع مشابه
Bifocal trial lenses.
IT is sometimes convenient to demonstrate to a patient, who has not worn them before, the usefulness of bifocal glasses. There is in existence a foreign trial frame in which the ordinary trial lens can be clipped in from below so that the upper part occupies the same position as the reading segment of a bifocal. This appears to be a clumsy arrangement since the lower portion of the lens may not...
متن کاملMyopia Control with Bifocal Contact Lenses: A Randomized Clinical Trial.
PURPOSE Most studies have reported only minimal reductions in myopia progression with bifocal or progressive multifocal spectacles, although somewhat larger, although mostly still clinically insignificant, effects have been reported in children with nearpoint esophoria and/or accommodative dysfunctions. The CONTROL study was a 1-year, prospective, randomized, clinical trial of bifocal contact l...
متن کاملA randomized clinical trial of progressive addition lenses versus single vision lenses on the progression of myopia in children.
PURPOSE The purpose of the Correction of Myopia Evaluation Trial (COMET) was to evaluate the effect of progressive addition lenses (PALs) compared with single vision lenses (SVLs) on the progression of juvenile-onset myopia. METHODS COMET enrolled 469 children (ages 6-11 years) with myopia between -1.25 and -4.50 D spherical equivalent. The children were recruited at four colleges of optometr...
متن کاملSmart Lenses
Focus + context techniques are widely used for the efficient visualization of large data sets. However, the corresponding adaptation of the representation to the task at hand is not trivial, requiring a suitable model of the visualization goal. One type of focus + context technique is the use of lenses, interactive tools that modify the visualization in a locally confined region and can be ’sta...
متن کاملDevil's lenses.
In this paper we present a new kind of kinoform lenses in which the phase distribution is characterized by the "devil's staircase" function. The focusing properties of these fractal DOEs coined devil's lenses (DLs) are analytically studied and compared with conventional Fresnel kinoform lenses. It is shown that under monochromatic illumination a DL give rise a single fractal focus that axially ...
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ژورنال
عنوان ژورنال: British Journal of Ophthalmology
سال: 1950
ISSN: 0007-1161
DOI: 10.1136/bjo.34.11.701-a