Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Valdemar Portney"'
Publikováno v:
Optics express. 29(11)
Using the internally placed elastic membrane and multi-chamber configuration, we designed a digitized mini optofluidic element for fast switching between refractive and diffractive states of preset optical powers. Relief surface was used in the diffr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::36ee051855e6d7cce110a8e050e761ad
https://pubmed.ncbi.nlm.nih.gov/34154180
https://pubmed.ncbi.nlm.nih.gov/34154180
Publikováno v:
Optical Engineering. 60
Current optofluidic devices are analog focus-tunable elements with a continually varying focus between foci. An innovative digitized optofluidic element was developed to enable fast switching between the foci. The operation involves an internally pla
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c0b0fb348c6d5677a487ad0619b3c5bd
https://doi.org/10.1117/1.oe.60.6.065103
https://doi.org/10.1117/1.oe.60.6.065103
Publikováno v:
Optometry and Vision Science. 72:511-521
Problem. If changes are made to the optics of the eye (e.g., intraocular lens implants, contact lenses, etc.) how will they affect performance on clinical tests of vision? Method. A phenomenological method is presented based on in vitro optical trans
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::235fc9672d32e809e426290f20a896c7
https://doi.org/10.1097/00006324-199507000-00012
https://doi.org/10.1097/00006324-199507000-00012
Autor:
Gholam A. Peyman, Rong Sun, Debbie Trentacost, Jeffrey E. Koziol, Jim Son Chou, Valdemar Portney, Robert Cionni
Publikováno v:
Ophthalmic Surgery, Lasers and Imaging Retina. 25:675-684
The teledioptric lens implant, with a high-minus central zone, was evaluated on an optical bench and implanted in the eyes of 50 patients with both cataract and age-related macular degeneration. In vitro testing demonstrated slightly reduced contrast
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::66a391e1bf75de963ac59bf5b025af35
https://doi.org/10.3928/1542-8877-19941101-04
https://doi.org/10.3928/1542-8877-19941101-04
Autor:
Valdemar Portney
Publikováno v:
Optometry and vision science : official publication of the American Academy of Optometry. 89(2)
Purpose To demonstrate a new optic edge design that preserves advantages of the square-edged optic and substantially reduces intensity of the light pattern formed at the retina by internal reflection off the optic edge. Methods Non-sequential ray tra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e3df59c60b6b80cb77c0b18bf3c2b56d
https://pubmed.ncbi.nlm.nih.gov/22157977
https://pubmed.ncbi.nlm.nih.gov/22157977
Autor:
Valdemar Portney
Publikováno v:
Optometry and vision science : official publication of the American Academy of Optometry. 89(1)
PURPOSE To present a bi-sign aspheric intraocular lens (IOL) and make theoretical comparisons with spherical and one-sign aspheric IOLs for retinal image quality in mesopic conditions and intermediate image capability in photopic conditions. METHODS
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f39a3f5e238ba00c76960bf7eee4388f
https://pubmed.ncbi.nlm.nih.gov/22041588
https://pubmed.ncbi.nlm.nih.gov/22041588
Autor:
Valdemar Portney, Alan Lang
Publikováno v:
Journal of Cataract and Refractive Surgery. 19:505-512
The optical performance of new multifocal intraocular lens designs is frequently assessed using the modulation transfer function (MTF). We discuss the relationship between the MTF and clinical measures of human visual function, such as threshold visu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d28f9e46c870525e02c7e918ba5c1c05
https://doi.org/10.1016/s0886-3350(13)80615-3
https://doi.org/10.1016/s0886-3350(13)80615-3
Autor:
Valdemar Portney
Publikováno v:
Journal of cataract and refractive surgery. 37(11)
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dd3105bd07f35f559dd61a3c2f59ae69
https://pubmed.ncbi.nlm.nih.gov/22018367
https://pubmed.ncbi.nlm.nih.gov/22018367
Autor:
Valdemar Portney
Publikováno v:
Journal of Cataract and Refractive Surgery. 18:607-613
A method of in vitro optical performance evaluation of intraocular lenses (IOLs) is discussed. The IOLs are tested in the eye cell, which is designed to be optically equivalent to the theoretical eye model. The eye cell is a combination of a wet cell
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b36fccd779e7b438dbc93140e1e33262
https://doi.org/10.1016/s0886-3350(13)80453-1
https://doi.org/10.1016/s0886-3350(13)80453-1
Autor:
Christine F. Dr. Kreiner, Edward P. Geraghty, Laurence W. Grossman, Anil S. Patel, Donn M. Silberman, N.E. Sverker Norrby, Masatoshi Mihori, Valdemar Portney
Publikováno v:
Journal of cataract and refractive surgery. 24(5)
Purpose: To validate the proposed optical requirements of a draft international standard for intraocular lenses (IOLs). Setting: Eight optical testing laboratories in the United States, Germany; Japan, and The Netherlands. Methods: The testing labora
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e90aae206a1eaa4f7548af330ec8ba12
https://pubmed.ncbi.nlm.nih.gov/9610458
https://pubmed.ncbi.nlm.nih.gov/9610458