摘要:
A method is provided for manufacturing ophthalmically-acceptable, distortion-free silicone hydrogel contact lenses without the use of volatile organic solvents in the manufacturing process. The contact lenses are extract with an extraction liquid comprising an aqueous solution of a non-volatile organic solvent, such as ethyl lactate.
摘要:
Eine Silikon-Kontaktlinse weist einen radialen Querschnitt der Innenfläche der Kontaktlinse auf, dessen Randbereichs-Kontur zwischen einem Wendepunkt und der Außenkante konvex ist. Zu ihrer Herstellung wird ein Silikon-Vorläufermaterial zwischen eine weibliche und eine männliche Form eingebracht und polymerisiert, und die polymerisierte Kontaktlinse wird mittels einer diese quellenden Flüssigkeit aus der Form ausgelöst und ohne Randbearbeitung fertiggestellt.
摘要:
There are described a method for applying a coating to a surface of an ophthalmic lens mold. The mold comprises male and female (20) mold halves, with each of the mold halves being provided with a lens forming surface (21). The method includes - applying a temporary coating to at least a portion of at least one of the male and female mold halves (20), the temporary coating being capable of reducing adhesive forces between a lens forming material and the lens forming surface (21); and - drying the temporary coating applied to the portion of the lens forming surface (21). Also described is a device (1) for applying such temporary coating to the portion of the lens forming surface (21) of the ophthalmic lens mold.
摘要:
A method of making a contact lens involves adding a lens-forming mixture to a contact lens mold, copolymerizing the lens-forming monomers to form a contact lens, releasing the contact lens from the mold; and removing the polymeric material from the contact lens. The polymeric material is not reactive with the lens-forming monomers, but is included in the lens-forming monomer mixture to facilitate releasing the contact lens from the mold.
摘要:
This invention includes methods and systems for processing hydrogel ophthalmic lenses comprising silicone using aqueous solutions as leaching aids and as release aids, by exposing said ophthalmic lens to a first aqueous solution comprising about 4% or more of 2-pentanol; and heating said first aqueous solution to which the ophthalmic lens is exposed.
摘要:
The instant invention pertains to a method and a fluid composition for producing contact lenses with improved lens quality and with increased product yield. The method of the invention involves adding a non-crosslinkable hydrophilic polymer into a fluid composition including a lens-forming material in an amount sufficient to reduce an averaged mold separation force by at least about 40% in comparison with that without the non-crosslinkable hydrophilic polymer and to provide a disparity of about 10 N or less in mold separation force. The non-crosslinkable hydrophilic polymer has a limited miscibility with the lens-forming material low enough to successfully and timely form an intact interfacial film with a sufficient thickness at an interface between the mold and the fluid composition therein, and has a structure that minimizes entanglement of the non-crosslinkable hydrophilic polymer in the interfacial film with the polymer matrix of the formed lens.
摘要:
The present invention discloses improved methods and systems for inspecting an ophthalmic lens by exposing the ophthalmic lens to a processing aid solution that includes RCO 2 CH 2 CH 2 0(CH 2 CH 2 O) x CH 2 CH 2 O 2 CR where R comprises (equals) at least one of : CF 3 CF 2 (CF2) x CH 2 ; CH 3 CH 2 (CH2) x CH 2 ; and Ry[Si(CH 3 )2o] x (CH2) 3 , while the lens is contained in a ophthalmic lens receptacle, in order to facilitate the removal of bubbles and center the lens in the ophthalmic lens receptacle with a reduced incidence of ophthalmic lenses being folded over on themselves. The decreased incidence of bubbles and proper positioning of the ophthalmic lens in turn facilitates accurate inspection.
摘要:
Described is a production line (1) for the production of ophthalmic lenses (10) that comprises a molding apparatus (2), at least one molding-shell-storage (3), at least one molding-shell-transporting-means (4), at least one operating unit (5), and preferably also a demolding apparatus (7) and molding-shell washing means (8). Said molding apparatus (8) and said demolding apparatus (7) are both suitable for fully automatized molding and demolding of ophthalmic lenses (10) and lens treatments such as coloring, hard coating and anti-reflective coating of lenses (10).
摘要:
The present invention provides an optically clear, hydrophilic coating upon the surface of a silicone medical device by sequentially subjecting the surface of the lens to plasma polymerization in a hydrocarbon-containing atmosphere and then covalently attaching a preformed hydrophilic polymer to the surface of the carbon coating. The invention is especially useful for forming a biocompatible coating on a silicone contact lens.
摘要:
The invention concerns a method which consists in: (a) heating the article uniformly in the mould, at a temperature ranging between Tg + 20 DEG C and Tg + 80 DEG C, where Tg is the glass transition temperature of the transparent polymer material, without separating the article and the mould parts; and (b) applying an external mechanical force for separating at least one of the mould parts from the article while the latter is at said stripping temperature.