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 کاملBiological Bifocal Lenses with Image Separation
Almost all animal eyes follow a few, relatively well-understood functional plans. Only rarely do researchers discover an eye that diverges fundamentally from known types. The principal eye E2 of sunburst diving beetle (Thermonectus marmoratus) larvae clearly falls into the rarer category. On the basis of two different tests, we here report that it has truly bifocal lenses, something that has be...
متن کاملOptical quality differences between three multifocal intraocular lenses: bifocal low add, bifocal moderate add, and trifocal.
PURPOSE To compare the in vitro optical quality at different focal points of two new bifocal intraocular lenses (IOLs) and one new trifocal IOL. METHODS The AcrySof ReSTOR SV25T0 (+2.5 diopter [D] add) and the AcrySof ReSTOR SN6AD1 (+3.0 D add) with two main foci (Alcon Laboratories, Fort Worth, TX) and the AT LISA tri 839MP with three main foci (Carl Zeiss Meditec, Dublin, CA) were evaluated...
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 کاملPredicting and assessing visual performance with multizone bifocal contact lenses.
PURPOSE To investigate how bifocal contact lenses, when combined with the aberrations of the eye, will affect visual performance. Also, to investigate the relationship between the patient's predicted and actual visual benefit with bifocal contact lenses. METHODS The monochromatic aberrations of 16 subjects were measured and used to simulate visual quality with three bifocal contact lens desig...
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ژورنال
عنوان ژورنال: Transactions of the Optical Society
سال: 1908
ISSN: 1475-4878
DOI: 10.1088/1475-4878/10/1/304