MOLDS FOR MAKING CONTACT LENSES

摘要

The present invention general related to a 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. At least one of the mold halves is made from a sulfur containing polymer having a refraction index greater than 1.5. The dimension stability of the plastic mold can be improved.

主权项

1. A mold for making a contact lens, comprising a first mold half having a first mold surface in contact with a silicone containing lens forming composition and a second mold half having a second mold surface in contact with the lens-forming composition, wherein 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, wherein the cavity defines the shape of a contact lens to be molded, wherein the lens forming composition is polymerizable and/or crosslinkable by actinic radiation or thermal energy, wherein at least one of the mold halves is made from a sulfur containing polymer having a refraction index greater than 1.5.