Abstract: An injection needle includes a needle tube having a discharging port at a needle point for discharging a treatment liquid, the needle tube including a stabbing tube having a blade surface with the discharging port formed thereon, and a main needle tube which is thicker than the stabbing tube, with the stabbing tube provided on a tip portion of the main needle tube, wherein the stabbing tube satisfies a dimension condition such that an outer diameter is 70 ?m or less (not including zero), and an inner diameter is 40 ?m or less (not including zero), and a tilt angle ? of the blade surface with respect to a central axis of the stabbing tube satisfies a condition of 30°<??45°.

Abstract: A lens holding ring 50 is held by a string-like body 40a stretched along a surface of an eyeball 1 by being supported by a plurality of cannulas 21, 22 inserted to a sclera 2, and is fixed to the surface of the eyeball 1 by a tensile stress of the string-like body 40a, and in this state, holds a surgery lens 30 on the eyeball. The lens holding ring 50 comprises a lens holder 51 including an opening 52 into which a lens is inserted, and engagement parts 57 provided at positions opposed to each other across the opening 52. Each engagement part has an engagement structure of engaging with the string-like body 40a for fixing the lens holder to the surface of the eyeball so as to interpose the lens holder therein, and has a folded part 58 on the tip of the engagement part for preventing coming-off of the string-like body.

Abstract: A lens holding ring 50 is held by a string-like body 40a stretched along a surface of an eyeball 1 by being supported by a plurality of cannulas 21, 22 inserted to a sclera 2, and is fixed to the surface of the eyeball 1 by a tensile stress of the string-like body 40a, and in this state, holds a surgery lens 30 on the eyeball. The lens holding ring 50 comprises a lens holder 51 including an opening 52 into which a lens is inserted, and engagement parts 57 provided at positions opposed to each other across the opening 52. Each engagement part has an engagement structure of engaging with the string-like body 40a for fixing the lens holder to the surface of the eyeball so as to interpose the lens holder therein, and has a folded part 58 on the tip of the engagement part for preventing coming-off of the string-like body.

Abstract: 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 lens 10 for vitreous surgery used to observe the ocular fundus 3 during vitreous surgery, an antireflection film 14 produced by ion beam sputtering is coated onto the upper surface 13 of a lens main body 11, and the antireflection film is a multilayered film in which a high refractive index layer 18 that contains tantalum pentoxide (Ta2O5) and a low refractive index layer 19 that contains silicon dioxide (SiO2) are alternatingly layered.

Abstract: 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 lens 10 for vitreous surgery used to observe the ocular fundus 3 during vitreous surgery, an antireflection film 14 produced by ion beam sputtering is coated onto the upper surface 13 of a lens main body 11, and the antireflection film is a multilayered film in which a high refractive index layer 18 that contains tantalum pentoxide (Ta2O5) and a low refractive index layer 19 that contains silicon dioxide (SiO2) are alternatingly layered.

Abstract: An injector which enables an operator to safely insert an intraocular lens without a mishandling is provided. An injector 1 for inserting an intraocular lens which has a loop folded and loaded in a cartridge into an eye by pushing out that lens while rotating it, comprises insertion-start-position indicating means 32 which indicates a position at the time of starting inserting the intraocular lens, and insertion-complete-position indicating means 2 which indicates a position at the time of completing the insertion of the intraocular lens. It is possible to easily figure out the orientation of the intraocular lens loaded in the cartridge 6 at the time of inserting the intraocular lens, thus making it possible to prevent a cornea or the like from being harmed by the loop of the intraocular lens.

Abstract: This invention relates to a contact lens formed of a copolymer containing, as essential components, at least one fluorine-containing monomer and at least one hydrophilic monomer, and the contact lens of this invention has hydrous nature and sufficient oxygen permeability to alleviate a burden which is caused on the cornea when a contact lens is fitted on.

Abstract: 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.

Abstract: 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.