optics of diffractive multifocal iol
نویسندگان
چکیده
the diffractive multifocal iol provides simultaneous bifocal imaging by utilizing both diffractive and refractive optics. in both distant and near vision, there is a clear highly focused image on the retina. the second image is highly defocused, providing only faint background illumination. a small amount of the light goes to the higher orders of diffraction which are not perceptible by eyes. the bright spot produced by a zone plate is so intense that the plate acts much like a converging lens. there are also fainter images corresponding to focal lengths f/3, f/5, f/7, ...
منابع مشابه
Clinical outcomes with a new microincisional diffractive multifocal IOL
BACKGROUND To evaluate the refractive outcomes and the optical performance as well as the quality of life in patients implanted with a new diffractive multifocal intraocular lens (IOL). METHODS Prospective, clinical study including 41 cases of patients who underwent cataract surgery and were divided in two groups: group 1, including 20 eyes implanted with the multifocal IOL SeeLens MF (Hanita...
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PURPOSE To expand a geometrical model of diffraction efficiency and its interpretation to the multifocal optic and to introduce formulas for analysis of far and near light distribution and their application to multifocal intraocular lenses (IOLs) and to diffraction efficiency optimization. SETTING Medical device consulting firm, Newport Coast, California, USA. DESIGN Experimental study. M...
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Purpose. To evaluate visual performance for near, intermediate, and distant vision; complaints of photic phenomena, and patient satisfaction with the new diffractive multifocal IOL used in eyes which underwent phacoemulsification. Methods. Two thousand and five hundred consecutive eyes undergoing Tecnis ZM900 multifocal IOL implantation were included in this retrospective analysis. The minimum ...
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متن کاملاپتیک عدسی داخل چشمی چند کانونی تفرقی
The diffractive multifocal IOL provides simultaneous bifocal imaging by utilizing both diffractive and refractive optics. In both distant and near vision, there is a clear highly focused image on the retina. The second image is highly defocused, providing only faint background illumination. A small amount of the light goes to the higher orders of diffraction which are not perceptible by eyes. T...
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عنوان ژورنال:
مجله دانشکده پزشکی دانشگاه علوم پزشکی تهرانجلد ۵۲، شماره ۱، صفحات ۷۷-۸۴
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