An improved method for cast moulding contact lenses employs mold sections injection molded from a specific class of thermoplastic, polyolefin resins. The present invention relates to improvements in static cast molding of contact lenses.

A method known, in general, for manufacturing contact lenses is static cast molding. Cast molding of contact lenses involves depositing a curable mixture of polymerizable monomers in a mold cavity formed by two mold sections, curing the monomer mixture, and disassembling the mold assembly and removing the lens. One mold section forms the anterior lens surface, and the other mold section forms the posterior lens surface.

Silicone hydrogel lenses are a made from an innovative group of extremely oxygen permeable contact lens materials. The development of these materials arose from the desire to eliminate the hypoxic responses known to occur as a result of wearing conventional hydrogel materials on an extended wear basis.

It was proposed that combining the properties of silicone and hydrogel materials would offer many advantages including the comfort and wet ability of hydrogels and the high oxygen transmissibility of silicone.

Silicone hydrogel materials differ considerably from the silicone rubber lenses used for therapeutic or paediatric applications. Although silicone-elastomeric lenses offered exceptional oxygen transmission and durability, a number of major limitations are associated with their use in clinical practice. As fluid is unable to flow through the lens and the lens surfaces are hydrophobic, binding to the ocular surface is very likely.

In silicone hydrogel materials, silicone rubber is combined with conventional hydrogel monomers. The silicone component of these lens materials provides extremely high oxygen permeability, while the hydrogel component facilitates fluid transport and thus lens movement. Unfortunately, this process or combination is not without difficulty and it has therefore taken some considerable time for these materials and designs to come to fruition. The process of combining these monomers as done by Contact Lens Technologists Pte Limited has been likened to efforts of combining oil with water, while maintaining optical clarity.

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Business Name: CLTech

Address: 116 Emerald Hill Road Singapore, 229397

Registration Number: 200619006K

Phone: (65) 6954 8964

Email: [email protected]

Website: https://www.cltech.com.sg/