摘要:
An optimized aspheric lens has improved optics when implanted into a patient having a curved retina. Light entering the optimized aspheric lens on-axis or at an angle to the optical axis is properly focused by the lens, reducing aberrations and producing a much smaller spot size of light on the retina. A method of selecting the optimized values for variables of the lens design, such as base radii of the front and back surface of the lens, conic constants of the front and back surfaces, and/or center thickness of the lens, among other possible parameters is provided. The method includes calculating changes in a merit function while changing the various values for the variables and selecting an optimized merit function.
摘要:
La présente invention concerne un procédé détermination de la configuration d'une lentille ophtalmique destinée augmenter la profondeur du champ de vision de l'utilisateur. Ce procédé comporte les étapes de détermination de la forme d'un élément correcteur optique de base en fonction d'au moins l'un des paramètres suivants : puissance recherchée de la lentille ophtalmique; résolution ou fonction de transfert de modulation FTM recherchée; étendue recherchée de la correction des aberrations sphériques de ladite lentille ophtalmique; étendue recherchée de la correction des aberrations sphériques de la cornée de l'utilisateur; étendue recherchée de la correction des aberrations chromatiques de ladite lentille ophtalmique; étendue recherchée de la correction des aberrations chromatiques de la cornée de l'utilisateur; ou étendue recherchée de la correction d'aberrations d'ordre supérieur (HOA). Il comporte en outre une étape de détermination du profil d'une structure diffractive de distribution de phase, cette détermination comportant les étapes de définition d'une profondeur de focalisation recherchée de ladite lentille ophtalmique; de calcul de la distribution de phase à partir de la profondeur de focalisation recherchée; de recherche des phases qui minimisent les différences entre la distribution effective de phase et la distribution de phase recherchée; de conversion des données de phase en données géométriques de façon à définir le profil de la structure diffractive de distribution de phase. Le procédé comporte finalement une étape de juxtaposition de la structure diffractive et de l'élément correcteur optique de base. L'invention concerne en outre une lentille obtenue selon le procédé ci-dessus ainsi qu'un procédé de fabrication d'une telle lentille.
摘要:
A device for treating fecal incontinence in a subject is provided. The device includes a plug configured for positioning mostly within an anal canal of the subject.
摘要:
For the pre-operative calculation of the power of an intraocular lens, three input parameters are needed: the axial length of the eye (AL), the refractive power of the cornea, and the distance between the front of the cornea and the back focal plane of the intraocular lens, the so-called effective lens position (ELP). The invention shows a novel approach to the determination of the ELP.
摘要:
The present invention relates to a method of determining the IOL refractive index for an ocular replacement material for replacing tissue in the capsular bag comprising combining a neutral (non-correcting) reference refractive index ("NRRI") of between 1.421 and 1.450 with a refractive index correction factor ("RICF") ascertained by reference to the refractive power required to correct the patient's refractive error. The present invention also relates to methods of treating presbyopia, myopia and hyperopia using the above method.
摘要:
Die vorliegenden Erfindung schafft ein Verfahren und eine Vorrichtung zur Herstellung eines entsprechend einer anatomischen Sollform vorgeformten flächigen Implantats (I) für einen menschlichen oder tierischen Körper. Das Verfahren umfasst folgenden Schritte: Bereitstellen eines Rohlings des flächigen Implantats, Bereitstellen einer Vorformeinrichtung (V) , wekche eine Mehrzahl diskreter einstellbarer Stützeinrichtung (STE) zum Einstellen einer zugehörigen Mehrzahl von Stützpunkten entsprechend der anatomischen Sollform aufweist; Vergeben der anatomischen Sollform und Ermitteln entsprechender Einstellungen für die Stützeinrichtungen; Einstellen der Stützeinrichtungen entsprechend der für die anatomischen Sollform ermittelten Einstellungen; und Bilden des vorgeformten Implantats durch Anbiegen des Rohlings an die eingestellten Stützeinrichtungen .
摘要:
A coated coronary stent, comprising: a stainless steel sent framework coated with a primer layer of Parylene C; and a rapamycin-polyrner coating having substantially uniform thickness disposed on the stent framework, wherein the rapamycin-polymer coating comprises polybutyl methacrylate (PBMA), polyethylene-co-vinyl acetate (PEVA) and rapamycin, wherein substantially all of the rapamycin in the coating is in amorphous form and substantially uniformly dispersed within the rapamycin-polymer coating.
摘要:
A method of manufacturing an intraocular lens that has been customized to provide optimum vision for an eye with prior corneal refractive surgery. Such a custom manufactured IOL will address not only optical correction requirements as currently met by spherical or toric-shaped IOLs, but will correct higher order optical aberrations using needed optimum customized shapes.
摘要:
In a method and system for producing an implant, the latter is designed with one or more surfaces extending in the longitudinal direction of the implant. Two or three production stages can be used. In one stage, either a topography with a long wave pattern is produced by means of cutting work, or laser bombardment or further cutting work is used to produce a topography with an intermediate-length wave pattern. In addition, an oxidation process or shot-peening or etching is used to produce an outer layer. When using two of said production stages, said cutting work or said laser bombardment or further cutting work is followed by the oxidation process or the shot-peening or etching method. When using all three production stages, cutting work is followed by laser bombardment, or further cutting work, which in turn is followed for example by the oxidation process. The invention also relates to an implant which is produced using the method and is identified, ordered and produced using the system. The invention permits effective treatment of different implant situations.
摘要:
The present invention discloses methods of obtaining ophthalmic lens capable of reducing the aberrations of the eye comprising the steps of characterizing at least one corneal surface as a mathematical model, calculating the resulting aberrations of said corneal surface(s) by employing said mathematical model, selecting the optical power of the intraocular lens. From this information, an ophthalmic lens is modeled so a wavefront arriving from an optical system comprising said lens and corneal model obtains reduced aberrations in the eye. Also disclosed are ophthalmic lenses as obtained by the methods which are capable reducing aberrations of the eye.