How are eye lenses made?

Eye lenses are made using different processes depending on the material (glass or plastic). Semi-finished glass lenses involve a specific manufacturing process that starts with melting raw materials.

Here's how semi-finished glass lenses are made:

1. Mixing Raw Materials: The process begins with natural materials such as:

   • Quartz
   • Potassium carbonate
   • Soda
   • Oxide

2. Melting: These materials are then melted together at very high temperatures, specifically between 1400° to 1500° Celsius. This intense heat transforms the mixture into a molten glass.

3. Pressing: The molten glass is then pressed into a round block. These blocks, known as "pressings," are typically one to three centimeters thick. These pressings serve as the semi-finished lens blanks.