Which statement is true about cast-molded contact lenses?

Which statement is true about cast-molded contact lenses?

• A. They Are The Most Durable To Wear
• B. They Are The Least Expensive Contact To Manufacture
• C. They Provide The Highest Oxygen Permeability
• D. They Are The Most Comfortable

Answer: (B)

Cast-molded contact lenses are formed by filling a mold with liquid monomer and allowing it to cure, which enables high-volume, automated production. This streamlined process cuts several manufacturing steps, such as grinding and polishing, so the cost per lens is typically lower than with more labor-intensive methods. Oxygen permeability, a property governed mainly by the lens material (not the molding method), often depends on whether the material is a hydrogel or a silicone hydrogel; historically, hydrogel-based cast-molded lenses didn’t offer the highest oxygen transmission compared with silicone hydrogel lenses. Durability and comfort are largely influenced by the material properties and lens design rather than the molding method itself. For these reasons, cast-molded lenses are generally the least expensive to manufacture, making that statement the most accurate.

Cast-molded contact lenses are formed by filling a mold with liquid monomer and allowing it to cure, which enables high-volume, automated production. This streamlined process cuts several manufacturing steps, such as grinding and polishing, so the cost per lens is typically lower than with more labor-intensive methods. Oxygen permeability, a property governed mainly by the lens material (not the molding method), often depends on whether the material is a hydrogel or a silicone hydrogel; historically, hydrogel-based cast-molded lenses didn’t offer the highest oxygen transmission compared with silicone hydrogel lenses. Durability and comfort are largely influenced by the material properties and lens design rather than the molding method itself. For these reasons, cast-molded lenses are generally the least expensive to manufacture, making that statement the most accurate.