Abstract:
The present invention general related to a reusable mold for making a contact lens comprises a first mold half having a first mold surface in contact with a polymerizable and/or crosslinkable silicone containing lens forming composition and a second mold half having a second mold surface in contact with the lens- forming composition, and the first mold half and the second mold half are configured to receive each other such that a cavity is formed between the first mold surface and the second mold surface. The cavity defines the shape of a contact lens to be molded. The reusable mold has at least one of the mold halves being made from an oxide glass comprising fluorine and/or fluoride. The mold made by oxide glass comprising fluorine and/or fluoride demonstrates improving mold cleanability with water based cleaning process.
Abstract:
Described herein are devices for producing ophthalmic lenses including at least one mold half defining an optical surface where the mold half is made from a polymer that includes an aromatic polyimide, a polyphenylene, or a combination thereof. The devices exhibit numerous advantages including, but not limited to, good chemical resistance, durability, machineability, and UV absorbing properties. Also described are methods for producing ophthalmic lenses using the devices described herein. The ophthalmic lenses produced with the devices described herein exhibit excellent optical properties when compared to lenses produced from conventions molds.
Abstract:
An improved method of cast molding contact lenses, wherein a lens forming mixture is cured in the lens-shaped cavity formed between molding surfaces of a male and female mold sections, wherein the improvement comprises at least one of sections is injection molded from a copolymer of propylene and ethylene.
Abstract:
The invention is directed to a reusable mold (1) for making a contact lens and the reusable mold has at least one of the mold halves (11, 12) is made from an oxide glass having a Knoop Hardness less than HK 350. The invention is also directed to a method for making an optical part by single point diamond turning an oxide glass having a Knoop Hardness HK less than 350.
Abstract:
An ophthalmic lens mold comprising a mold half (32, 34) having a front side and a back side, wherein an optical surface (40, 42) on the front side is formed by a film or sheet material and wherein the main body of the mold half is formed by an injection moldable bulk material. The film or sheet material may be provided by over-molded in an injection molding process with the injection moldable bulk material. Also provided is a respective mold assembly comprising the ophthalmic lens mold and a method for making an ophthalmic lens with the ophthalmic lens mold.
Abstract:
The invention provide a method for cast-molding hydrogel contact lenses, especially silicone hydrogel contact lenses by using plastic molds of a poly(cycloalkylene-dιalkylene terephthalate) copolymer These plastic molds do not need to be degassed and stored in an oxygen-free atmosphere (e g, N2 or Ar) before being used for cast-molding silicone hydrogel contact lenses in the absence of oxygen and resultant silicone hydrogel lenses can still have relatively high ion permeability and relatively low variation in targeted optical power, compared with silicone hydrogel lenses made from a conventional mold material, such as polypropylene The invention also provides plastic molds for cast-molding silicone hydrogel contact lenses.