111 results about "Contact lens material" patented technology

A device and method for non-invasive real-time testing of blood sugar levels in a diabetic patient. Specifically, this invention is directed to an optical device comprising a contact lens having a glucose-sensing optical pattern imprinted, marked, coated or otherwise disposed on or incorporated within the contact lens. The indicator pattern is further comprised of a glucose-sensing coating containing a boronic acid derivative, which reacts in the presence of glucose to create a readable pattern, which can then be correlated to a pre-determined or pre-calibrated blood glucose level. A polarized light source is one method that may be used to read the indicator pattern. The invention is also directed to methods for quantifying blood glucose levels using the inventive optical device and manufacturing methods for disposing the glucose-sensing coating onto, or incorporating it into, the contact lens material.

Vinyl carbonate endcapped polysiloxanes containing a fluorinated side chain are useful as biomaterials, especially hydrogel biomaterials, including contact lens materials.

A contact lens is provided that is capable of being worn by a user. The lens includes a contact lens body having an eye-engaging surface placeable against a surface of an eye and an outer surface. Microphobic features are provided in the lens for eliminating microbes from the eye-engaging surface. Preferably, these microphobic features are chosen from a group consisting of electrical charge inducing agents, magnetic field inducing agents, chemical agents and textural features. In another embodiment of the present invention, a contact lens is provided that can include a reservoir portion capable of holding a performance enhancement agent for enhancing the performance of the lens. The performance enhancement agent can include such thins as sealant solutions, protective agents, therapeutic agents, anti-microbial agents, medications and reduced size transparent portions. In other embodiments, a wide variety of designs, materials and substances are disclosed for use with contact lenses.

A hybrid hard-soft contact lens is provided. Several embodiments of the invention include methods of coupling the hard and soft sections of the contact lens. Other embodiments of the invention include contact lens materials and coatings that increase oxygen transmission though the lens. Yet other embodiments of the invention are directed to cost-effective manufacturing methods of a hybrid hard-soft contact lens. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

The invention relates to a drug-loaded contact lenses and a corresponding preparation method. The drug-loaded contact lenses are obtained firstly through UV-curing or heat-curing and then through drug-liquid immersion. The drug-loaded contact lenses can be particularly defined as a combination of a contact lenses material containing cyclodextrin and drug molecules and comprise the contact lenses formed by combining a crosslinked polymer hydrogel formed by copolymerizing mono-substituted cyclodextrin monomers, polymerization monomers and crosslinkers with one kind or a plurality of acetazolamide, methazolamide, puerarin or prostaglandin. The characteristic of forming inclusion compounds between the cyclodextrin molecules and drug molecules is adopted to increase the quantity of loaded drugs so as to reduce the stimulation to eyes by drugs and control the drug release speed for eye diseases of curing glaucoma, etc.

The present invention is directed to an ophthalmic solution for soft contact lenses for controlled release of polyethers into an eye's tear film. Polyether components of the subject solution are released from the soft contact lens material matrix over long time periods to produce longer lasting wetting performance, improved lubricity, improved end-of-the-day comfort and reduced feeling of dryness from wearing contact lenses. The present invention also includes the use of cationic polyelectrolytes for controlling the swelling of hydrogel contact lenses typically caused by the absorption of high concentrations of polyethers.

Disclosed in this specification is a process for manufacturing a thermochromic contact lens. The process includes (1) selecting a photoinitiator that absorbs at a first wavelength and at least one thermochromic dye that displays substantial absorption at the first wavelength when the dye is at a first temperature and exhibits at least an 80% reduction in absorbance at the first wavelength at a second temperature, (2) maintaining the reaction mixture at the second temperature and (3) providing cure light that includes the first wavelength.

In accordance with the disclosure there is described herein a method of designing an anterior curve of a contact lens for the eye of a patient comprising the steps of providing a contact lens material having a posterior, a posterior curve having a predetermined asphericity, an anterior, an index of refraction and a center thickness; providing a geometry of a cornea, a distance power correction for the cornea and a near power correction for the cornea; determining a central distance power of the contact lens in air; calculating a central anterior radius of the contact lens using the posterior curve of the contact lens material, the index of refraction of the contact lens material, the center thickness of the contact lens material and the central distance power of the contact lens in air; calculating a center power of the contact lens on the eye of the patient using the index of refraction of tears at the posterior of the contact lens; and using an on-eye ray trace, said on-eye ray trace having a null lens compensation to create a targeted on-eye power profile.

This invention provides a mold for forming a contact lens comprising an overflow collector, which causes the overflow reactive mixture to be accumulated, and not to spread out as it would upon the typically flat surface of a prior art mold. This invention further provides a method of preventing the formation of contaminating pieces of overflow reactive mixture comprising the step of: preventing the overflow reactive mixture from spreading out on the mold.

The invention provides a hydrogel contact lens material and a preparation method thereof. The material comprises N-(1,3-dihydroxy-2-propyl) methyl acrylamide, acrylate monomer, acrylate crosslinker and initiating agent and is prepared through one-step ultraviolet-initiated or thermal-initiated polymerization. The preparation method comprises the steps as follows: the N-(1,3-dihydroxy-2-propyl) methyl acrylamide and acrylic acid or acrylamide monomer are uniformly mixed with the acrylate crosslinker and the initiating agent, or the N-(1,3-dihydroxy-2-propyl) methyl acrylamide and the acrylic acid or acrylamide monomer are uniformly mixed with the acrylate crosslinker, the initiating agent and diluent; then the mixture is poured into a mould to be subjected to one-step ultraviolet irradiation curing or heat curing in a baking oven; and the mould is opened and immersed in water or alcohol, so as to remove the diluent and unreacted monomer to obtain a hydrogel contact lens. The material has high water content and excellent water retention capacity.

Provided is a contact lens material. The material is characterized by comprising liquid raw materials, by weight, 90-100 parts of hydroxyethyl methylacrylate, 10-12 parts of n-vinyl pyrrolidone, 0.3-0.4 part of ethylene glycol dimethacrylate, 0.15-0.2 part of azodiisobutyronitrile and 0.7-1 part of yellow UV absorbents for contact lenses. The contact lenses have good oxygen permeation coefficient, good moisture content, moderate hardness and less residual components, and have functions of good ultraviolet protection and filtration of purple light and blue light.

The invention discloses a contact lens material, contact lenses, and a manufacturing method for contact lenses. The contact lens material comprises a siloxane polymer expressed by formula (I), wherein in the formula (I), R1, R2 and R3 are C1-C4 alkyl group, R4 is C1-C6 alkyl group, R5 is the residue obtained by removing NCO group from aliphatic or aromatic diisocyanate, R6 and R7 are alkylene group, n is an integer ranging from 4 to 80, and m is an integer ranging from 3 to 40; and the molecular weight of the siloxane polymer expressed by formula (I) is about 1000 to 10000. The contact lens material further comprises at least one hydrophilic monomer; a cross-linking agent or a siloxane polymer expressed by formula (II), wherein in the formula (II), p is an integer ranging from 4 to 80, and q is an integer ranging from 3 to 40; and an initiator.

A lens comprises an internal cavity structure formed by dissolution of a soluble insert material. The internal soluble material may dissolve through a body of a lens such as a contact lens in order to form the cavity within the contact lens. The cavity within the lens can be shaped in many ways, and corresponds to the shape of the dissolved material, such that many internal cavity shapes can be readily fabricated within the contact lens. The insert can be placed in a mold with a pre-polymer material, and the pre-polymer material cured with the insert placed in the mold to form the lens body. The polymerized polymer may comprise a low expansion polymer in order to inhibit expansion of the lens when hydrated. The polymer may comprise a hydrogel when hydrated. The soft contact lens material comprises a sufficient amount of cross-linking to provide structure to the lens and shape the cavity.