38 results about "Rigid gas permeable lens" patented technology

A corneal-scleral orthokeratology contact lens is formed of rigid gas permeable material with uniform arc lengths in the treatment area even when the corneal curvature varies and asymmetric blends or splines called minor zones, where the portion of the blend or spline is shorter toward the lens center and broader toward the lens edge, and relieve the treatment area of all centering responsibility, transferring it to the limbal-scleral region. The method of determining the total sagittal height of an eye at a given chord diameter to predetermine exact fitting parameters and predict unaided visual outcome trial lenses, with exact chord and sagittal height values used to match the sagittal height of an eye, the sagittal value may be obtained from some ocular topographers. A computer program can easily take the sagittal information and design an optimum lens.

A corneal-scleral orthokeratology contact lens is formed of rigid gas permeable material with uniform arc lengths in the treatment area even when the corneal curvature varies and asymmetric blends or splines called minor zones, where the portion of the blend or spline is shorter toward the lens center and broader toward the lens edge, and relieve the treatment area of all centering responsibility, transferring it to the limbal-scleral region. The method of determining the total sagittal height of an eye at a given chord diameter to predetermine exact fitting parameters and predict unaided visual outcome trial lenses, with exact chord and sagittal height values used to match the sagittal height of an eye, the sagittal value may be obtained from some ocular topographers. A computer program can easily take the sagittal information and design an optimum lens.

Embodiments of the technology relate to a contact lens having a core that is coated by a hydrogel layer, and to methods of making such a lens. The coated lens can include a rigid gas permeable contact lens. The coated lens can also include a hybrid silicone and rigid gas permeable contact lens. In one aspect, embodiments provide for a coated contact lens comprising a lens core with a water equilibrium constant of less than about 2% comprising an outer surface; and a hydrogel layer covalently attached to at least a portion of the outer surface, the hydrogel layer adapted to contact an ophthalmic surface, wherein the hydrogel layer comprises a hydrophilic polymer population of one or more species.

Novel polymers for biomedical use, especially rigid gas permeable contact lenses that are based on bulky side-chain siloxane cross linkers. The siloxanes, either alone, or as copolymers with bulky and non-bulky mono-functional polymerizable siloxanes, fluoro monomers, such as hexafluoroisopropyl methacrylate, and hydrophilic monomers, result in transparent, high oxygen permeable polymers possessing excellent lathing and milling characteristics.

A rigid gas permeable lens care composition. The composition includes a disinfecting amount of at least one biguanide antimicrobial agent and a straight chain polyether surfactant based upon PEO-PPO-PEO, PPO-PEO-PPO and combinations thereof. In one embodiment, the straight chain polyether surfactant has an HLB value of less than or equal to 15 and an average molecular weight value of between about 5000 and 7000. Preferably, no rubbing is required to disinfect the rigid gas permeable contact lenses is required. Methods of making and using the same are also described.

A shipping container is provided for transporting biologically hazardous materials. The shipping container includes a rigid gas permeable exterior enclosure and an interior positioned substantially gas impermeable flexible bag. Preferably, the exterior enclosure includes an outer cardboard box and inner foam box made of expanded polystyrene. Preferably, the inner bag is made of polyethylene and includes a conventional open top. Preferably, the bag also includes two laterally extending lines. A first line provides a visual indication to the user where air should be evacuated from the bag. A second line is provided to indicate where the bag should be sealed.

The present invention is directed to a composite lens, comprising an anterior rigid gas permeable layer, and an annulus of soft material bonded to a posterior surface of the anterior rigid gas permeable layer, wherein a central zone of the composite lens is rigid and without a soft layer, wherein a peripheral zone of the composite lens is generally rigid in its anterior aspect and soft in its posterior aspect.

An “accommodating contact lens” or “focusable contact lens” is a contact lens comprised of a single unit lens, primarily of a rigid gas permeable material, that has one optical power ground into the lens and is fitted for the eye for clear vision at distance when the eye is in a relaxed, unaccommodated state. Unlike a standard single vision, rigid gas permeable contact lens, it has a modified anterior surface, which exists as either an excavated, concave region or heaped ridge running the entire circular midperipheral to peripheral region of the contact lens, that allows the eyelids a contact point on the lens to re-shape or move the contact lens either by squeezing or lifting it anteriorly from the eye during an attempt to accommodate or focus at near, in order to provide to the eye additional power and clear vision at intermediate or near distances.

A method, computer program product, and data processing system for designing a contact lens. A sagittal image of an anterior portion of an eye having a sclera is measured. Measuring is performed using a digital imaging device. Measuring includes measuring the sclera. A sagittal image is formed. A shape of the eye is derived using the sagittal image, wherein the shape includes the sclera. The shape is converted to a curvature of a contact lens. The curvature is designed such that the contact lens, once manufactured, can be worn over a surface of the eye.

An apparatus for conveying fluidized high temperature finely divided dry material by gravity utilizes a multi-layered, gas permeable gas distributor member comprising (i) an upper layer a flat, rigid gas permeable, porous medium capable of withstanding temperatures up to about 2900° F. through which gas to fluidize the material will pass; (ii) a middle layer comprised of a gas permeable insulation material that maintains its physical integrity when exposed to temperature differentials ranging from about 500° F. to about 2900° F.; and (iii) a lower layer that supports the top and middle layers comprising a substantially flat plate having a plurality of openings therethrough through which fluidizing gas can pass.

A contact lens for wearing on a patient's eye comprises an anterior surface adapted to face away from the eye and a posterior surface adapted to face toward the eye. The posterior surface has an optical zone disposed in the center of the lens, a secondary zone coupled to the optical zone and extending radially therefrom, and a peripheral zone coupled to the secondary zone and extending radially therefrom. The curve of the optical zone is spherical and rearwardly concave, the curve of the secondary zone is aspheric and rearwardly concave, and the curve of the peripheral zone is spherical and rearwardly concave.

The invention relates to a method for modifying a material of a rigid gas-permeable corneal contact lens and discloses a method for modifying a fluorinated siloxane acrylate material of a rigid gas-permeable corneal contact lens through plasma treatment and grafting. The method comprises the following steps of carrying out plasma treatment on the fluorinated siloxane acrylate material of the rigid gas-permeable corneal contact lens; and soaking the treated material into a bionic macromolecular water solution to obtain the fluorinated siloxane acrylate material of the rigid gas-permeable corneal contact lens. According to the method, the fluorinated siloxane acrylate material of the rigid gas-permeable corneal contact lens is treated by using a plasma surface treatment method, and then, bionic macromolecules with high hydrophilia, good biocompatibility and protein absorption prevention property are grafted on the surface of the material, so that the hydrophilia of the material is improved, tear is relatively easily spread, the problem of poor comfort when the lens is worn for the first time is solved, the problem that proteins are accumulated because the lens is worn for a long term is not easily caused, the wearing time is prolonged, and the wearing comfort is improved.

A rigid gas permeable lens care composition. The composition includes a disinfecting amount of at least one biguanide antimicrobial agent and a straight chain polyether surfactant based upon PEO-PPO-PEO, PPO-PEO-PPO and combinations thereof. In one embodiment, the straight chain polyether surfactant has an HLB value of less than or equal to 15 and an average molecular weight value of between about 5000 and 7000. Preferably, no rubbing is required to disinfect the rigid gas permeable contact lenses is required. Methods of making and using the same are also described.

A copolymer useful as a rigid gas permeable contact lens material is the polymerization product of a monomeric mixture comprising a polysiloxane-containing urethane or urea prepolymer endcapped with polymerizable ethylenically unsaturated radicals.

The invention discloses a novel rigid gas permeable cornea contact lens, comprising a peripheral arc of the lens. The lens is characterized in that the inner rim of the peripheral arc of the contact lens is provided with two symmetric stable pterions or three stable pterions, wherein the distance of inner top end and outer top end of the stable pterion is between 0.2 and 7mm; the inside arc surface of the stable pterion can be a conical arc with an arch bottom angle of between 20 and 40 degrees; the inside arc surface of the stable pterion can be a spherical arc with the radius of curvature of between 6 and 25mm; the inside arc surface of the stable pterion can be a non-spherical arc, the difference of curvature radiuses of the starting point and the finishing point of the non-spherical arc is between 0 and 1mm, and the curvature radius of the starting / finishing point is between 6 and 25mm; and the inside arc of the stable pterion can be single arc or multi-arc which is a single multi-arc or combined multi-arc of the conical arc, the spherical arc or the non-spherical arc. The structure of the lens improves the stability and the centralization of various lenses in cornea, so that various cornea contact lenses can achieve the state that the comfort state is more comfortable, and the eyesight is more perfect.

The invention relates to an automatic small-sized rigid gas permeable contact lens polishing liquid cleaning apparatus which mainly solves the problems that the existing rigid gas permeable contact lens polishing equipment can not automatically discharge waste liquid, waste liquid settled in an equipment tank is easy to overflow, and clean production environment cannot be maintained easily, and production efficiency is greatly reduced as waste liquid needs to be cleaned frequently during production process. The cleaning apparatus comprises a container, a containing cavity is arranged in the container, an exhaust pipe and a liquid absorption pipe which are communicated with the containing cavity are arranged on the container, an outlet end of the exhaust pipe is communicated with a vacuum opening of a vacuum generator by a connector, an air inlet of the vacuum generator is communicated with a compressed air pipe, and a liquid inlet of the liquid absorption pipe is arranged at the bottom of a waste liquid tank. The apparatus has the advantages of convenience in use, easiness for control and good safety, can timely and fast treat the polishing waste liquid so as to prevent influence of the waste liquid on the production environment, and can effectively improve production efficiency of a rigid gas permeable contact lens through automatic cleaning.

A composite lens comprises an anterior rigid gas permeable layer, and an annulus of soft material bonded to a posterior surface of the anterior rigid gas permeable layer, wherein a central zone of the composite lens is rigid and without a soft layer, wherein a peripheral zone of the composite lens is generally rigid in its anterior aspect and soft in its posterior aspect.

A composite lens comprises an anterior rigid gas permeable layer, and an annulus of soft material bonded to a posterior surface of the anterior rigid gas permeable layer, wherein a central zone of the composite lens is rigid and without a soft layer, wherein a peripheral zone of the composite lens is generally rigid in its anterior aspect and soft in its posterior aspect.

The invention relates to an automatic small-sized rigid gas permeable contact lens polishing liquid cleaning apparatus which mainly solves the problems that the existing rigid gas permeable contact lens polishing equipment can not automatically discharge waste liquid, waste liquid settled in an equipment tank is easy to overflow, and clean production environment cannot be maintained easily, and production efficiency is greatly reduced as waste liquid needs to be cleaned frequently during production process. The cleaning apparatus comprises a container, a containing cavity is arranged in the container, an exhaust pipe and a liquid absorption pipe which are communicated with the containing cavity are arranged on the container, an outlet end of the exhaust pipe is communicated with a vacuum opening of a vacuum generator by a connector, an air inlet of the vacuum generator is communicated with a compressed air pipe, and a liquid inlet of the liquid absorption pipe is arranged at the bottom of a waste liquid tank. The apparatus has the advantages of convenience in use, easiness for control and good safety, can timely and fast treat the polishing waste liquid so as to prevent influence of the waste liquid on the production environment, and can effectively improve production efficiency of a rigid gas permeable contact lens through automatic cleaning.