Menicon Co., Ltd.

Tokai Carbon Company, Ltd.

Kowa Company Limited

Carl Zeiss Meditec Ag

Hiroaki Suzuki

Atsushi Kobayashi

Kazuhiko Nakada

Ichiro Ando

Yuuji Gotou

Shinji Misono

Kenichi Ishihara

Katsunori Yamada

Yukihisa Sakai

Hiroyuki Yamaguchi

Tetsuji Kawai

Sadanori Ohno

Hidenari Tanaka

The purpose of the present invention is to provide novel contact lens manufacturing method and contact lens capable of giving a lens inner surface shape reflecting a cornea shape of a contact lens wearer more easily than before with sufficient accuracy to reflect the cornea shape, thereby improving comfort during use. By using statistical information on a corneal surface shape obtained from a population of target eyes having a feature to be treated, a fitting for a rotationally-symmetric shape is performed based on a definitional equation using a radius of curvature (R) and a conic constant (C.C.) while a fitting for a rotationally-asymmetric shape is performed based on a definitional equation using a Zernike function. A shape of a lens rear surface () corresponding to the corneal surface shape specified by these definitional equations is adopted for a rear surface of a peripheral area of a contact lens ().

Contact lens manufacturing method and contact lens

Provided are a lens power measurement device and a lens power measurement method whereby lens power measurement results of a contact lens can be displayed in a manner which is easy to view, while maintaining fully satisfactory precision of the lens power measurement results. From lens power distribution information determined based on optical property measurement information of a contact lens, correction target information including positive and negative abnormal peaks on both sides of a lens central axis in a lens central area is selected. Lens power distribution measurement results are then obtained by applying substitution using a correction function that smoothes out the abnormal peaks to the selected correction target information to smooth the lens power measurement values.

Lens power measurement device and measurement method

In order to reduce halos that occur in multifocal ophthalmic lenses, the mechanism of the phenomenon was elucidated and a solution was found based on the results. Thus provided are a multifocal ophthalmic lens having a structure and a manufacturing method for the same which can effectively reduce halos. A multifocal ophthalmic lens having a focal point formation region provided to an optical portion of a lens, which forms at least two focal points, wherein a cancellation region is provided to the optical portion, the cancellation region providing diffracted light of an amplitude distribution that reduces, on the image plane of the first focal point among the focal points, the amplitudes of light other than the light that forms the first focal point.

Multifocal ophthalmic lens having a focal point formation region and a cancellation region and manufacturing method thereof

Provided is a diffraction-type multifocal ophthalmic lens for which halos are reduced. Also provided is a diffraction-type multifocal ophthalmic lens having three or more focal points, which is implemented on the basis of the discovery that the diffraction-type multifocal ophthalmic lens has a characteristic whereby multiple focal points can be generated in the intermediate region as well as the near and far regions. Also provided is a method for manufacturing a diffraction-type multifocal ophthalmic lens which provides a simple design and manufacturing method by means of a simple diffraction structure and by replacing a cumbersome computer simulation with a simple method. This diffraction-type multifocal ophthalmic lens has a diffraction structure () where a plurality of diffraction zones are formed concentrically on the lens (), and an equal-pitch region is provided where pitches of at least two zones among the diffraction zones are made equal.

Diffraction-type multifocal ophthalmic lens and manufacturing method thereof

A novel manufacturing method for a diffraction lens, whereby aperture and eccentricity effects can be suppressed and any multi-focusing effect can also be obtained in a more stable manner. A synchronous structure is set up where at least two reliefs whose first order diffracted lights give respective focal distances different from one another are set to overlap with each other in at least a part of an area in a radial direction of a diffraction lens, and with respect to every grating pitches of one relief having the maximum grating pitch among the reliefs set up in overlap, grating pitches of another relief are overlapped periodically; and the resulting relief pattern is formed on a surface of an optical material.

Method of manufacturing a diffraction lens other than an aphakic intraocular lens

A method of manufacturing an aphakic intraocular lens that is capable of ensuring every multi-focusing effect more securely, while reducing the impact of aperture changes and lens eccentricity. At least two reliefs whose first order diffracted lights give respective focal distances different from one another are set to overlap with each other in at least a part of an area in a radial direction of the lens, and with respect to every grating pitches of one relief having a maximum grating pitch among the reliefs set up in overlap, grating pitches of another relief are overlapped periodically in order to obtain a relief pattern, so that the resulting relief pattern is formed on a lens surface.

Method for manufacturing aphakic intraocular lens

An intraocular lens adapted for deployment within a lens capsule. At least part of a lens surface of the intraocular lens constitutes a cell inducing region in which are directly formed a multitude of microgrooves. The microgrooves take a form of minute linear grooves and lands of depth dimension between 0.01 and 1.0 &#x3bc;m and width dimension between 0.1 and 2.0 &#x3bc;m extending with prescribed length in a circumferential direction on the lens surface. The minute linear grooves and lands are formed with a chained pattern connected in the circumferential direction of the lens surface and with a periodic pattern arrayed periodically in a diametrical direction so that the minute linear grooves and lands are formed without intervening spaces throughout the entire cell inducing region and impart visible light transmittance of 60% or above to the cell inducing region.

Intraocular lens and manufacturing method thereof

It is an object to provide a novel system for supporting contact lens users, who has not been provided with an after-selling support sufficiently, which is able to provide an appropriate support to individual contact lens user so that he can use contact lenses with comfortable. In order to attain the object, an image signal of the user's currently used contact lenses () acquired by a user client apparatus () is transmitted via communication network means (), to a server apparatus () of a supporting entity (). The server apparatus () then obtains lens condition evaluation data, which are stored in memory means () and transmitted via the communication network means () to the user client apparatus () so that the user () can be provided with the lens condition evaluation data.

Contact lens user support system and support method

It is intended to provide a method of selecting a contact lens suitable for a wearer and/or a care system therefor, by which the occurrence of problems (for example, worsening in the feel during wearing, lowering in the oxygen permeability of the lens, shortening in the lens life, lowering in the visual acuity, corneal injury, etc.) can be minimized to thereby ensure a high safety for the eye, namely, a method which comprises collecting the lacrimal fluid of a wearer, detecting the protein content and/or the lipid content in the lacrimal fluid thus obtained (Step S), estimating the dirt adhesion characteristics of the wearer to a contact lens based on the protein content and/or lipid content thus detected, and then selecting a contact lens suitable for the wearer and/or a care system therefor from among a plurality of contact lenses and a plurality of care systems (Step S).

Method of selecting contact lens and/or care system therefor

A method of obtaining particulars or characteristics of an ophthalmic lens by detecting a fluorescent light which is emitted from the ophthalmic lens upon exposure to an excitation light (UV light). The particulars or characteristics of the ophthalmic lens include, for instance, identifying marks such as characters, figures, symbols, etc. which are formed in the ophthalmic lens to identify the ophthalmic lens, a thickness of the ophthalmic lens such as a contact lens and an intraocular lens, and an angular position of the ophthalmic lens, particularly of a special contact lens having circumferential portions having respective different thickness values.

Method of obtaining particulars of ophthalmic lens

A method of marking an ophthalmic lens, including a step of irradiating the ophthalmic lens formed of a resin material with a laser radiation, such that the laser radiation is condensed at each of predetermined at least one spot within the ophthalmic lens, to form a whitened portion at the each of the predetermined at least one spot, for thereby providing the ophthalmic lens with a marking.

Method of marking ophthalmic lens by using laser radiation

A method of marking an ophthalmic lens, including a step of irradiating the ophthalmic lens formed of a resin material with a laser radiation of a femtosecond pulse width, such that the laser radiation is condensed at each of at least one predetermined spot within the ophthalmic lens, to form a whitened portion at the each of the at least one predetermined spot, for thereby providing the ophthalmic lens with a marking.

Method of marking ophhalmic lens by using laser radiation of femtosecond pulse width

A method of modifying a surface of an ophthalmic lens, includes the steps of: generating plasma at an atmospheric pressure between electrodes of a plasma generating device; and blowing the plasma from the plasma generating device by introducing a gas between the electrodes. The ophthalmic lens, which is located outside the plasma generating device, is irradiated with the plasma blown out from the plasma generating device to modify the surface of the ophthalmic lens to form a final ophthalmic lens product.

Method of modifying ophthalmic lens surface by plasma generated at atmospheric pressure

According to this invention, a rubber composition is provided, which comprises 100 parts by weight of a rubber component and 25 to 250 parts by weight of carbon black, which carbon black falls within the property range of an electron-microscopic average particle diameter (dn) of above 31 millimicron, an iodine adsorption number of 35 to 60 mg/g and a dibutyl phthalate absorption number (DBP) of 90 to 150 ml/100 g and further has a selected property such that the Dst mode diameter (m.mu.) is below the value (m.mu.) obtained from the following equation:

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Kasugai, Japan

Hiroaki Suzuki