Hoya Corporation

Hideyuki Futamura

Yuuichi Yokoyama

Masashi Nomura

Makoto Tsuchiya

Kazuaki Kadonosono

A lens holding ringis held by a string-like bodystretched along a surface of an eyeballby being supported by a plurality of cannulasinserted to a sclera, and is fixed to the surface of the eyeballby a tensile stress of the string-like body, and in this state, holds a surgery lenson the eyeball. The lens holding ringcomprises a lens holderincluding an openinginto which a lens is inserted, and engagement partsprovided at positions opposed to each other across the opening. Each engagement part has an engagement structure of engaging with the string-like bodyfor fixing the lens holder to the surface of the eyeball so as to interpose the lens holder therein, and has a folded parton the tip of the engagement part for preventing coming-off of the string-like body.

Holding device for contact lens for vitreous surgery, holding device set, and contact lens for vitreous surgery, and lens set

An object of the present invention is to provide a contact lens for vitreous surgery that is highly durable to washing, disinfectants, sterilizing high-pressure steam, and the like, and that has good antireflection effect in the visible light range. In the contact lensfor vitreous surgery used to observe the ocular fundusduring vitreous surgery, an antireflection filmproduced by ion beam sputtering is coated onto the upper surfaceof a lens main body, and the antireflection film is a multilayered film in which a high refractive index layerthat contains tantalum pentoxide (TaO) and a low refractive index layerthat contains silicon dioxide (SiO) are alternatingly layered.

Lens for intraocular observation and contact lens for vitreous surgery

Contact lens

A contact lens material which is suitable for producing a contact lens having intermediate and low hydrous nature and which has hardness suitable for machining by cutting and polishing, is formed of a copolymer obtained by copolymerizing a monomer mixture which contains, based on 100 parts by weight of the monomer mixture, 35 to 65 parts by weight of at least one fluorine-containing monomer of the formula (I), ##STR1## wherein R.sub.1 is CH.sub.3, R.sub.2 is H or CH.sub.3, a is an integer of 1 to 9, m is an integer of 1 to 5, n is an integer of 4 to 10, p is an integer of 8 or greater, q is an integer of 0 or greater, and p, q and n have the relationship of p+q=2n+1, and 30 to 45 parts by weight of at least one amide group-containing monomer as essential components and which also contains other monomer as an optional component. The contact lens is obtained from the above contact lens material.

Contact lens material and contact lens

The present invention relates to a high water content soft contact lens containing 50-70% of water, obtained by copolymerizing five particular monomers at particular proportions. The high water content soft contact lens of the present invention has excellent durability to stain removers, a high mechanical strength and excellent shape retention.

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Kamisato, Japan

Hideyuki Futamura